What is the primary cause of convectional rainfall?
Heating of air that rises and cools
There are three main types of rainfall:
Convectional rainfall — caused by intense surface heating. Warm, moist air rises rapidly, expands, cools and condenses into cumulus clouds, producing short heavy showers with thunder. Common in equatorial regions and on hot summer afternoons.
Orographic rainfall — moist air is forced to rise over a mountain barrier (option B describes this).
Cyclonic/frontal rainfall — warm and cold air masses meet at a front (option A describes this).
Hence the answer is Heating of air that rises and cools.
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