As Air Sinks in a Valley Fog,it

Multiple Choice

As air sinks in a valley fog,it

A) cools adiabatically but it is still cooler than the surrounding air; the surrounding air is cooled to the dew point.
B) warms adiabatically but it is still cooler than the surrounding air; the surrounding air is cooled to the dew point.
C) warms adiabatically but it is still warmer than the surrounding air; the surrounding air is warmed to the dew point.
D) cools adiabatically but it is still warmer than the surrounding air; the surrounding air is cooled to the dew point.