Why Are Most Deserts Found at 30 Degrees Latitude

Multiple Choice

Why are most deserts found at 30 degrees latitude?

A) This is where warm dry air falls from cells originating at the equator.
B) This is where winds coming off the oceans pull water from the air, drying out the surface.
C) This is where sunlight strikes the earth at the most direct angle, so all water evaporates.
D) These areas are not close to any ocean, so water levels in the air are extremely low.