ONGC

Oil And Natural Gas Corp.

232.89 +0.89 (0.38%)

L: 231.5 H: 233.5

Back to Option Chain

Historical option data for ONGC
19 Dec 2025 04:11 PM IST

Strike Price

Expiry

Ltp Ltp OI Open Interest (OI) OI Chg Change Open Interest Volume Volume IV IV

Call
Put

Per Lot

ONGC 30-DEC-2025 257.5 CE
Delta: - Vega: - Theta: - Gamma: -
Date	Close	Ltp	Change	IV	Volume	OI Chg	OI
19 Dec	232.89	0.08 ₹ 180	-0.03 -67.50	-	0 0	0 0	122 2,74,500
18 Dec	232.00	0.08 ₹ 180	-0.03 -67.50	26.79	1 2,250	0 0	122 2,74,500
17 Dec	232.91	0.11 ₹ 247.5	0.07 157.50	26.43	45 1,01,250	41 92,250	122 2,74,500
16 Dec	232.21	0.04 ₹ 90	-0.07 -157.50	-	11 24,750	-3 -6,750	82 1,84,500
15 Dec	235.35	0.11 ₹ 247.5	0 0.00	22.03	28 63,000	-6 -13,500	85 1,91,250
12 Dec	238.02	0.11 ₹ 247.5	-0.06 -135.00	17.52	15 33,750	2 4,500	91 2,04,750
11 Dec	238.41	0.17 ₹ 382.5	-0.03 -67.50	17.81	31 69,750	-9 -20,250	89 2,00,250
10 Dec	239.29	0.21 ₹ 472.5	-0.03 -67.50	17.82	43 96,750	-5 -11,250	99 2,22,750

9 Dec	239.84	0.24 ₹ 540	-0.01 -22.50	17.55	61 1,37,250	-12 -27,000	104 2,34,000
8 Dec	238.52	0.25 ₹ 562.5	-0.19 -427.50	18.28	32 72,000	-1 -2,250	116 2,61,000
5 Dec	241.23	0.46 ₹ 1,035	-0.04 -90.00	16.18	65 1,46,250	3 6,750	118 2,65,500
4 Dec	242.23	0.54 ₹ 1,215	0.06 135.00	16.39	188 4,23,000	-28 -63,000	113 2,54,250
3 Dec	240.02	0.46 ₹ 1,035	-0.3 -675.00	17.03	140 3,15,000	13 29,250	141 3,17,250
2 Dec	243.54	0.77 ₹ 1,732.5	-0.21 -472.50	15.82	42 94,500	-2 -4,500	128 2,88,000
1 Dec	244.83	0.99 ₹ 2,227.5	-0.11 -247.50	15.71	89 2,00,250	47 1,05,750	129 2,90,250
28 Nov	243.25	1.1 ₹ 2,475	-0.25 -562.50	17.10	28 63,000	6 13,500	81 1,82,250
27 Nov	244.00	1.3 ₹ 2,925	-0.6 -1350.00	16.87	33 74,250	2 4,500	75 1,68,750
26 Nov	247.70	1.9 ₹ 4,275	0.4 900.00	15.54	45 1,01,250	12 27,000	72 1,62,000
25 Nov	245.35	1.5 ₹ 3,375	-0.9 -2025.00	16.37	75 1,68,750	42 94,500	60 1,35,000
24 Nov	245.75	2.4 ₹ 5,400	-0.55 -1237.50	-	0 0	14 31,500	0 0
21 Nov	246.95	2.4 ₹ 5,400	-0.55 -1237.50	17.20	18 40,500	12 27,000	16 36,000
20 Nov	248.05	2.95 ₹ 6,637.5	-0.2 -450.00	17.34	7 15,750	0 0	3 6,750
19 Nov	249.00	3.15 ₹ 7,087.5	-4.25 -9562.50	16.66	3 6,750	2 4,500	2 4,500
18 Nov	246.95	7.4 ₹ 16,650	0 0.00	2.75	0 0	0 0	0 0
17 Nov	248.05	7.4 ₹ 16,650	0 0.00	2.40	0 0	0 0	0 0
13 Nov	250.85	11.3 ₹ 25,425	0 0.00	1.00	0 0	0 0	0 0
12 Nov	253.85	11.3 ₹ 25,425	0 0.00	-	0 0	0 0	0 0
11 Nov	249.45	11.3 ₹ 25,425	0 0.00	1.54	0 0	0 0	0 0
10 Nov	251.40	11.3 ₹ 25,425	0 0.00	0.92	0 0	0 0	0 0
7 Nov	252.20	11.3 ₹ 25,425	0 0.00	0.52	0 0	0 0	0 0
6 Nov	251.50	11.3 ₹ 25,425	0 0.00	0.64	0 0	0 0	0 0
4 Nov	252.35	11.3 ₹ 25,425	0 0.00	0.17	0 0	0 0	0 0
3 Nov	257.55	11.3 ₹ 25,425	0 0.00	-	0 0	0 0	0 0
31 Oct	255.37	11.3 ₹ 25,425	0 0.00	-	0 0	0 0	0 0
30 Oct	254.53	11.3 ₹ 25,425	0 0.00	-	0 0	0 0	0 0
29 Oct	255.64	11.3 ₹ 25,425	0 0.00	-	0 0	0 0	0 0

For Oil And Natural Gas Corp. - strike price 257.5 expiring on 30DEC2025

Delta for 257.5 CE is -

Historical price for 257.5 CE is as follows

On 19 Dec ONGC was trading at 232.89. The strike last trading price was 0.08, which was -0.03 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 122

On 18 Dec ONGC was trading at 232.00. The strike last trading price was 0.08, which was -0.03 lower than the previous day. The implied volatity was 26.79, the open interest changed by 0 which decreased total open position to 122

On 17 Dec ONGC was trading at 232.91. The strike last trading price was 0.11, which was 0.07 higher than the previous day. The implied volatity was 26.43, the open interest changed by 41 which increased total open position to 122

On 16 Dec ONGC was trading at 232.21. The strike last trading price was 0.04, which was -0.07 lower than the previous day. The implied volatity was -, the open interest changed by -3 which decreased total open position to 82

On 15 Dec ONGC was trading at 235.35. The strike last trading price was 0.11, which was 0 lower than the previous day. The implied volatity was 22.03, the open interest changed by -6 which decreased total open position to 85

On 12 Dec ONGC was trading at 238.02. The strike last trading price was 0.11, which was -0.06 lower than the previous day. The implied volatity was 17.52, the open interest changed by 2 which increased total open position to 91

On 11 Dec ONGC was trading at 238.41. The strike last trading price was 0.17, which was -0.03 lower than the previous day. The implied volatity was 17.81, the open interest changed by -9 which decreased total open position to 89

On 10 Dec ONGC was trading at 239.29. The strike last trading price was 0.21, which was -0.03 lower than the previous day. The implied volatity was 17.82, the open interest changed by -5 which decreased total open position to 99

On 9 Dec ONGC was trading at 239.84. The strike last trading price was 0.24, which was -0.01 lower than the previous day. The implied volatity was 17.55, the open interest changed by -12 which decreased total open position to 104

On 8 Dec ONGC was trading at 238.52. The strike last trading price was 0.25, which was -0.19 lower than the previous day. The implied volatity was 18.28, the open interest changed by -1 which decreased total open position to 116

On 5 Dec ONGC was trading at 241.23. The strike last trading price was 0.46, which was -0.04 lower than the previous day. The implied volatity was 16.18, the open interest changed by 3 which increased total open position to 118

On 4 Dec ONGC was trading at 242.23. The strike last trading price was 0.54, which was 0.06 higher than the previous day. The implied volatity was 16.39, the open interest changed by -28 which decreased total open position to 113

On 3 Dec ONGC was trading at 240.02. The strike last trading price was 0.46, which was -0.3 lower than the previous day. The implied volatity was 17.03, the open interest changed by 13 which increased total open position to 141

On 2 Dec ONGC was trading at 243.54. The strike last trading price was 0.77, which was -0.21 lower than the previous day. The implied volatity was 15.82, the open interest changed by -2 which decreased total open position to 128

On 1 Dec ONGC was trading at 244.83. The strike last trading price was 0.99, which was -0.11 lower than the previous day. The implied volatity was 15.71, the open interest changed by 47 which increased total open position to 129

On 28 Nov ONGC was trading at 243.25. The strike last trading price was 1.1, which was -0.25 lower than the previous day. The implied volatity was 17.10, the open interest changed by 6 which increased total open position to 81

On 27 Nov ONGC was trading at 244.00. The strike last trading price was 1.3, which was -0.6 lower than the previous day. The implied volatity was 16.87, the open interest changed by 2 which increased total open position to 75

On 26 Nov ONGC was trading at 247.70. The strike last trading price was 1.9, which was 0.4 higher than the previous day. The implied volatity was 15.54, the open interest changed by 12 which increased total open position to 72

On 25 Nov ONGC was trading at 245.35. The strike last trading price was 1.5, which was -0.9 lower than the previous day. The implied volatity was 16.37, the open interest changed by 42 which increased total open position to 60

On 24 Nov ONGC was trading at 245.75. The strike last trading price was 2.4, which was -0.55 lower than the previous day. The implied volatity was -, the open interest changed by 14 which increased total open position to 0

On 21 Nov ONGC was trading at 246.95. The strike last trading price was 2.4, which was -0.55 lower than the previous day. The implied volatity was 17.20, the open interest changed by 12 which increased total open position to 16

On 20 Nov ONGC was trading at 248.05. The strike last trading price was 2.95, which was -0.2 lower than the previous day. The implied volatity was 17.34, the open interest changed by 0 which decreased total open position to 3

On 19 Nov ONGC was trading at 249.00. The strike last trading price was 3.15, which was -4.25 lower than the previous day. The implied volatity was 16.66, the open interest changed by 2 which increased total open position to 2

On 18 Nov ONGC was trading at 246.95. The strike last trading price was 7.4, which was 0 lower than the previous day. The implied volatity was 2.75, the open interest changed by 0 which decreased total open position to 0

On 17 Nov ONGC was trading at 248.05. The strike last trading price was 7.4, which was 0 lower than the previous day. The implied volatity was 2.40, the open interest changed by 0 which decreased total open position to 0

On 13 Nov ONGC was trading at 250.85. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was 1.00, the open interest changed by 0 which decreased total open position to 0

On 12 Nov ONGC was trading at 253.85. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 11 Nov ONGC was trading at 249.45. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was 1.54, the open interest changed by 0 which decreased total open position to 0

On 10 Nov ONGC was trading at 251.40. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was 0.92, the open interest changed by 0 which decreased total open position to 0

On 7 Nov ONGC was trading at 252.20. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was 0.52, the open interest changed by 0 which decreased total open position to 0

On 6 Nov ONGC was trading at 251.50. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was 0.64, the open interest changed by 0 which decreased total open position to 0

On 4 Nov ONGC was trading at 252.35. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was 0.17, the open interest changed by 0 which decreased total open position to 0

On 3 Nov ONGC was trading at 257.55. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 31 Oct ONGC was trading at 255.37. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 30 Oct ONGC was trading at 254.53. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 29 Oct ONGC was trading at 255.64. The strike last trading price was 11.3, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

ONGC 30DEC2025 257.5 PE
Delta: - Vega: - Theta: - Gamma: -
Date	Close	Ltp	Change	IV	Volume	OI Chg	OI
19 Dec	232.89	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
18 Dec	232.00	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
17 Dec	232.91	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
16 Dec	232.21	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
15 Dec	235.35	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	0 0
12 Dec	238.02	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
11 Dec	238.41	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
10 Dec	239.29	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
9 Dec	239.84	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	0 0
8 Dec	238.52	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	18 40,500
5 Dec	241.23	14.19 ₹ 31,927.5	2.19 4927.50	-	0 0	0 0	0 0
4 Dec	242.23	14.19 ₹ 31,927.5	2.19 4927.50	15.95	1 2,250	0 0	18 40,500
3 Dec	240.02	11.9 ₹ 26,775	0.4 900.00	-	0 0	0 0	0 0
2 Dec	243.54	11.9 ₹ 26,775	0.4 900.00	-	0 0	0 0	0 0
1 Dec	244.83	11.9 ₹ 26,775	0.4 900.00	-	0 0	0 0	0 0
28 Nov	243.25	11.9 ₹ 26,775	0.4 900.00	-	0 0	0 0	0 0
27 Nov	244.00	11.9 ₹ 26,775	0.4 900.00	-	0 0	0 0	0 0
26 Nov	247.70	11.9 ₹ 26,775	0.4 900.00	-	0 0	10 22,500	0 0
25 Nov	245.35	11.9 ₹ 26,775	0.4 900.00	17.07	12 27,000	9 20,250	17 38,250
24 Nov	245.75	11.5 ₹ 25,875	-3.9 -8775.00	-	0 0	8 18,000	0 0
21 Nov	246.95	11.5 ₹ 25,875	-3.9 -8775.00	19.83	8 18,000	7 15,750	7 15,750
20 Nov	248.05	15.4 ₹ 34,650	0 0.00	-	0 0	0 0	0 0
19 Nov	249.00	15.4 ₹ 34,650	0 0.00	-	0 0	0 0	0 0
18 Nov	246.95	15.4 ₹ 34,650	0 0.00	-	0 0	0 0	0 0
17 Nov	248.05	15.4 ₹ 34,650	0 0.00	-	0 0	0 0	0 0
13 Nov	250.85	15.55 ₹ 34,987.5	0 0.00	-	0 0	0 0	0 0
12 Nov	253.85	15.55 ₹ 34,987.5	0 0.00	0.04	0 0	0 0	0 0
11 Nov	249.45	15.55 ₹ 34,987.5	0 0.00	-	0 0	0 0	0 0
10 Nov	251.40	15.55 ₹ 34,987.5	0 0.00	-	0 0	0 0	0 0
7 Nov	252.20	15.55 ₹ 34,987.5	0 0.00	-	0 0	0 0	0 0
6 Nov	251.50	15.55 ₹ 34,987.5	0 0.00	-	0 0	0 0	0 0
4 Nov	252.35	15.55 ₹ 34,987.5	0 0.00	-	0 0	0 0	0 0
3 Nov	257.55	15.55 ₹ 34,987.5	0 0.00	1.27	0 0	0 0	0 0
31 Oct	255.37	15.55 ₹ 34,987.5	0 0.00	-	0 0	0 0	0 0
30 Oct	254.53	15.55 ₹ 34,987.5	0 0.00	0.39	0 0	0 0	0 0
29 Oct	255.64	15.55 ₹ 34,987.5	0 0.00	1.27	0 0	0 0	0 0

For Oil And Natural Gas Corp. - strike price 257.5 expiring on 30DEC2025

Delta for 257.5 PE is -

Historical price for 257.5 PE is as follows

On 19 Dec ONGC was trading at 232.89. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 18 Dec ONGC was trading at 232.00. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 17 Dec ONGC was trading at 232.91. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 16 Dec ONGC was trading at 232.21. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 15 Dec ONGC was trading at 235.35. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 12 Dec ONGC was trading at 238.02. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 11 Dec ONGC was trading at 238.41. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 10 Dec ONGC was trading at 239.29. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 9 Dec ONGC was trading at 239.84. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 8 Dec ONGC was trading at 238.52. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 18

On 5 Dec ONGC was trading at 241.23. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 4 Dec ONGC was trading at 242.23. The strike last trading price was 14.19, which was 2.19 higher than the previous day. The implied volatity was 15.95, the open interest changed by 0 which decreased total open position to 18

On 3 Dec ONGC was trading at 240.02. The strike last trading price was 11.9, which was 0.4 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 2 Dec ONGC was trading at 243.54. The strike last trading price was 11.9, which was 0.4 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 1 Dec ONGC was trading at 244.83. The strike last trading price was 11.9, which was 0.4 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 28 Nov ONGC was trading at 243.25. The strike last trading price was 11.9, which was 0.4 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 27 Nov ONGC was trading at 244.00. The strike last trading price was 11.9, which was 0.4 higher than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 26 Nov ONGC was trading at 247.70. The strike last trading price was 11.9, which was 0.4 higher than the previous day. The implied volatity was -, the open interest changed by 10 which increased total open position to 0

On 25 Nov ONGC was trading at 245.35. The strike last trading price was 11.9, which was 0.4 higher than the previous day. The implied volatity was 17.07, the open interest changed by 9 which increased total open position to 17

On 24 Nov ONGC was trading at 245.75. The strike last trading price was 11.5, which was -3.9 lower than the previous day. The implied volatity was -, the open interest changed by 8 which increased total open position to 0

On 21 Nov ONGC was trading at 246.95. The strike last trading price was 11.5, which was -3.9 lower than the previous day. The implied volatity was 19.83, the open interest changed by 7 which increased total open position to 7

On 20 Nov ONGC was trading at 248.05. The strike last trading price was 15.4, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 19 Nov ONGC was trading at 249.00. The strike last trading price was 15.4, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 18 Nov ONGC was trading at 246.95. The strike last trading price was 15.4, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 17 Nov ONGC was trading at 248.05. The strike last trading price was 15.4, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 13 Nov ONGC was trading at 250.85. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 12 Nov ONGC was trading at 253.85. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was 0.04, the open interest changed by 0 which decreased total open position to 0

On 11 Nov ONGC was trading at 249.45. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 10 Nov ONGC was trading at 251.40. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 7 Nov ONGC was trading at 252.20. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 6 Nov ONGC was trading at 251.50. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 4 Nov ONGC was trading at 252.35. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 3 Nov ONGC was trading at 257.55. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was 1.27, the open interest changed by 0 which decreased total open position to 0

On 31 Oct ONGC was trading at 255.37. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was -, the open interest changed by 0 which decreased total open position to 0

On 30 Oct ONGC was trading at 254.53. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was 0.39, the open interest changed by 0 which decreased total open position to 0

On 29 Oct ONGC was trading at 255.64. The strike last trading price was 15.55, which was 0 lower than the previous day. The implied volatity was 1.27, the open interest changed by 0 which decreased total open position to 0

Related Pages for ONGC

ONGC

360ONE

ABB

ABCAPITAL

ADANIENSOL

ADANIENT

ADANIGREEN

ADANIPORTS

ALKEM

AMBER

AMBUJACEM

ANGELONE

APLAPOLLO

APOLLOHOSP

ASHOKLEY

ASIANPAINT

ASTRAL

AUBANK

AUROPHARMA

AXISBANK

BAJAJ-AUTO

BAJAJFINSV

BAJFINANCE

BANDHANBNK

BANKBARODA

BANKEX

BANKINDIA

BANKNIFTY

BDL

BEL

BHARATFORG

BHARTIARTL

BHEL

BIOCON

BLUESTARCO

BOSCHLTD

BPCL

BRITANNIA

BSE

CAMS

CANBK

CDSL

CGPOWER

CHOLAFIN

CIPLA

COALINDIA

COFORGE

COLPAL

CONCOR

COPPER

CROMPTON

CRUDEOIL

CRUDEOILM

CUMMINSIND

CYIENT

DABUR

DALBHARAT

DELHIVERY

DIVISLAB

DIXON

DLF

DMART

DRREDDY

EICHERMOT

ETERNAL

EURINR

EURUSD

EXIDEIND

FEDERALBNK

FINNIFTY

FORTIS

GAIL

GBPINR

GBPUSD

GLENMARK

GMRAIRPORT

GODREJCP

GODREJPROP

GOLD