Atmospheric Pressure Decreases as One Moves to Higher Elevations Because

Multiple Choice

Atmospheric pressure decreases as one moves to higher elevations because

A) the force of gravity is weaker on a mountain than at sea level.
B) it is much colder on a mountain than at sea level.
C) the air moves at higher speeds near mountains than over the oceans.
D) there is much less air above a mountain than above the oceans.