What is the convection pattern between 30°S and 30°N latitude?

A : Hotter air rises and moves away from the equator, then cools and falls and moves back to the equator.

B : Cooler air rises and moves away from the equator, then warms and falls and moves back to the equator.

C : Cooler air rises and moves toward the equator, then warms and falls and moves away from the equator.

D : Hotter air rises and moves toward the equator, then cools and falls and moves away from the equator.