Discussion
Which difference does that irreversibility make to the lapse rate?
Answer: D
The reversible and pseudo-adiabatic lapse rates differ by only a few tenths of a kelvin per kilometre, because the heat capacity of the condensed water is small compared with that of the air. The distinction matters for precision work and for the thermodynamic definition rather than for practical forecasting. Real ascent lies somewhere between the two idealisations. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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