Which of the Following Best Defines a Rain Shadow

Multiple Choice

Which of the following best defines a rain shadow?

A) The shadow on the moon that lets you know rain is coming.
B) The dark streaks of rain failing from under a cloud when seen from a distance.Looks like a misty shadow.
C) The lack of precipitation on the side of a mountainous area that faces away from prevailing winds
D) The side of the mountain that gets a higher percentage of rain that faces toward the prevailing winds.