At About 30 Degrees North and South of the Equator

Multiple Choice

At about 30 degrees north and south of the equator there are dry regions on Earth.Why?

A) Warm air rises and evaporates, leaving dry, cool air with no clouds.
B) Cool air falls, is warmed, and absorbs moisture.
C) Warm air falls and absorbs moisture as it cools near the surface.
D) Cool air rises, and water condenses.
E) Air flows laterally across the land from the temperate zone.