The side of a mountain facing away from the wind is known as the side.
a. dark
b. leeward
c. windward
d. steep

The side of the mountain that is not facing the wind is called the leeward side

b. leeward

Explanation:

This is also known as the shadow zone that is created by the orographic effects of the mountain as the winds that reach the other end of the mountain has a rainfall and the other side remains dry and the winds laden with raindrops are unable to move farther apart and hence most of the rain is caused by this reason n the western side and the eastern side experiences dryness and thus called as the leeward side.

It is the second answer

Answerfur trade;