Which fact most directly explains India's area?

Correct answer: 3.28 million sq km

The governing concept is the difference between area, geographic coordinates and linear distance. Area describes the extent of a surface and must be written in square units. Option A, 3.28 million square kilometres, directly states the size of India's territory. Option B is 82°30'E, the Standard Meridian used for Indian Standard Time, so it describes longitude. Option C is 23°30'N, a latitude associated with the Tropic of Cancer, so it describes north-south position. Option D is a length in kilometres, commonly associated with India's coastline, not its surface area. Therefore A is the only direct area fact.