The Difference Between the "Moist" and "Dry" Adiabatic Rates Is

Multiple Choice

The difference between the "moist" and "dry" adiabatic rates is due to

A) the fact that saturated air is always unstable.
B) the fact that an unsaturated air parcel expands more rapidly than a saturated air parcel.
C) the fact that moist air weighs less than dry air.
D) the fact that latent heat is released by a rising parcel of saturated air.