Discussion
Which rate does a saturated parcel cool at?
Answer: C
Latent heat released by condensation offsets part of the adiabatic cooling, so the saturated rate is smaller, ranging from about 4 kelvin per kilometre in warm moist air to nearly the dry value in very cold air. Condensation releases rather than removes heat, which is the point the second option gets wrong. The rate is not constant, which is why saturated adiabats are curved on a thermodynamic diagram. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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