The correct description of the convection pattern between 30°S and 30°N latitude is:
Hotter air rises and moves away from the equator, then cools and falls and moves back to the equator.
This pattern is part of the Hadley cell circulation, where warm air rises near the equator, moves towards the poles at higher altitudes, cools, and then descends at around 30° latitude before returning toward the equator at the surface.