Discussion
Which contribution does falling precipitation make to the entropy budget?
Answer: D
Raindrops falling at terminal velocity dissipate their potential energy as heat through drag, generating entropy at a rate comparable with the mechanical dissipation of the wind. It is a surprisingly large term that is often overlooked. The apparent order of the falling drops is irrelevant, since entropy accounting concerns heat and temperature rather than visual arrangement. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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