In India's location if a question hints at east-west distance which coordinate should be given priority?

Correct answer: Longitude

The direct answer is A, longitude. East-west position and extent are described by meridians of longitude. Step by step: latitude measures distance north or south of the Equator; longitude measures position east or west of the Prime Meridian; therefore a question about India's east-west distance points first to longitude. Option A is correct. Option B, latitude, is used mainly for north-south extent, so it does not answer this clue. Option C, sea wave, is a physical movement of water and is not a coordinate. Option D, mountain height, describes elevation above sea level and does not locate east-west spread. Longitude is also related to local time because the Earth rotates from west to east, although the question here mainly asks about distance. Do not confuse east-west extent with north-south extent. Memory cue: latitude is like “ladder” lines across the map for north-south; longitude gives east-west location and time.