As air moves from the base up the side of a mountain, it cools. What is one consequence of this movement of air?

A)Moisture will drop as rain as the air moves up the side of the mountain.
B)The air is deflected and circles back down to the base of the mountain.
C)The air slows because cold air is less dense than warm air.
D)The air picks up additional moisture that falls on the other side of the mountain.