Why Does Evaporation of a Liquid Also Cool the Gas

Why does evaporation of a liquid also cool the gas above it?

A) The departing gas molecule takes some kinetic energy with it as it leaves the surface.
B) The overall heat decreases because the air cools.
C) The average energy of the system increases because of the increased disorder in the new gas molecules.
D) The gas molecules need to transfer their kinetic energy to the new slower gas molecule.
E) none of the above