Most of India's rainfall is ________

Answer: Option D

* Orographic rainfall happens when moist air is forced to rise over natural barriers like mountains. As the air rises, it cools, and the moisture condenses to form clouds and rain. This is the main reason for heavy rainfall in areas like the Western Ghats and the Himalayas.
* Cyclonic rainfall is associated with cyclones. While India experiences cyclones, they don't account for the majority of the country's rainfall.
* Convectional rainfall occurs when the ground is heated, causing air to rise. This is more common in hotter regions, but not the primary source of India's overall rainfall.
* Elusive means difficult to find or catch, which doesn't relate to rainfall types.
Therefore, since mountain ranges significantly influence rainfall patterns across large parts of India, orographic rainfall is the most accurate answer.