Discussion
Which process compensates the ascent within a convective cloud?
Answer: B
Mass continuity requires the strong narrow updraught to be balanced by gentle subsidence spread over a much larger surrounding area, typically a hundred times the cloud's own cross-section. This compensating subsidence warms and dries the environment, which is how convection stabilises the atmosphere. Convective downdraughts do exist but are driven by evaporative cooling and precipitation drag rather than by continuity. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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