Deserts Typically Occur in a Band Around 30 Degrees North

Deserts typically occur in a band around 30 degrees north and 30 degrees south latitude because

A) descending air masses originating from the tropical areas tend to be dry.
B) ascending air masses absorb moisture and create an arid,desert climate.
C) moisture-laden air is heavier than dry air and is not carried to these latitudes.
D) these locations get the most intense solar radiation of any location on Earth.