Well, c is the only one on the list that is specifically a force per unit area.
However I think the question is misleading because everything listed leads to motion or changes of motion in the air and water.
Because both the atmosphere and the oceans are fluid, what force is free to deform them?
A. The Earth's rotation
B. Gravity
C. Air pressure
D. The wind
My answer is c.
2 answers
the answer was b.