The sinking of dry air results in the formation of what terrestrial biome?

The sinking of dry air results in the formation of deserts. Dry air would absorb water from the surrounding area. Since the air moves, it would carry this moisture away. Therefore the dry air produces little precipitation and removes any available moisture from the area producing a desert. This typically happens at about 30 degrees north and 30 degrees south latitude. Hot moist air rises at the equator. The water condenses and falls as rain. As the air moves north and south it becomes dry and sinks at approximately 30 degrees north and south. This dry air allows deserts to be formed.

Dshould be the right answer i think