Discussion
Which quantity should be compared to assess buoyancy correctly?
Answer: B
Buoyancy depends on density, and moist air is lighter than dry air at the same temperature, so the comparison must use virtual temperature. In the tropics the correction reaches several kelvin and is comparable with the temperature excess of a plume. Potential and equivalent potential temperature are the right variables for comparing parcels at different levels, but the buoyancy at a given level is a density comparison. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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