Which explains why air masses move?

A.
Even heating across the globe creates differences in air pressure, which causes differences in temperature that drive winds and air masses.

B.
The clockwise rotation of the earth drives winds and air masses.

C.
Uneven heating across the globe creates differences in temperature, which causes differences in air pressure that drive winds and air masses.

D.
The counterclockwise rotation of the earth drives winds and air masses.