Which one of the following provides the force needed to drive the atmospheric circulation?

Options

A. Higher biotic content of the tropical latitudes and lower biotic content of the polar latitudes
B. The energy contrasts between high insolation tropical latitudes and the low insolation polar latitudes
C. Higher rotational speed of lower latitudes and lower rotational speed of higher latitudes
D. Equatorial radius of the earth is longer than the polar radius

Answer

B