According to the model of atmospheric circulation, why would there be little precipitation at the north and south poles?

A) Polar cells prevent condensation of moisture so that it remains in vapor form.
B) Polar cells remove moisture from the equator and distribute it to the Tropics of Cancer and Capricorn.
C) Polar cells retain all of the heat in the upper atmosphere so that only cold air is deposited at the surface.
D) Polar cells deposit cold, dry air at the surface, which leaves little moisture for evaporation and condensation.