In This Model of Atmospheric Water,why Is Location C a Desert

In this model of atmospheric water,why is location C a desert?

A) the atmosphere cannot rise above the mountains that shadow the area
B) the actual shadow of clouds at B causes cold dry conditions at C
C) the shadow of the mountains keeps plants from growing at C
D) the water vapor sinking at A keeps point C dry
E) moist air is forced to rise and cool over the mountains,decreasing the amount of water vapor available to point C