Discussion
Which lapse rate does saturated ascent follow?
Answer: C
Latent heat release offsets some of the adiabatic cooling, so the saturated rate is less than 9.8 and varies from about 4 kelvin per kilometre in warm moist air to nearly the dry value in very cold air. It increases with height as the moisture is depleted, which makes the last option partly right, but the essential point is that it is smaller than the dry rate and not constant. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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