What is the correct reason for linking India's north-south extent with climatic diversity?

Correct answer: Change in latitude changes sun angle and temperature

The governing concept is latitudinal control of solar heating. India extends from the tropical south toward the subtropical north, so the angle at which the Sun’s rays strike the surface changes from one latitude to another. More direct rays concentrate energy over a smaller area, while oblique rays spread energy over a larger area; this produces differences in heating and average temperature. Latitude also interacts with altitude, relief, distance from the sea, winds, and monsoon circulation, creating further climatic variation. Option A is correct because it gives the fundamental geographical reason. Longitude primarily helps explain time differences, not the main north-south temperature pattern. The remaining options confuse coastline, area, or soil with the cause of climatic diversity.