Discussion
Which quantity is the moist entropy of an air parcel related to?
Answer: B
Moist entropy is approximately proportional to the logarithm of the equivalent potential temperature, so a parcel conserving that quantity conserves its moist entropy. This is why equivalent potential temperature is conserved for both dry and saturated adiabatic motion. The parallel with the dry case, where entropy is tied to potential temperature, is exact enough to be a useful guide. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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