One Might Expect the Dominant Circulation in Earth's Atmosphere to Be

One might expect the dominant circulation in Earth's atmosphere to be one large convection cell in each hemisphere, with air rising at the equator due to solar heating, moving toward the poles at high altitude, cooling and sinking, then returning toward the equator along the surface. The actual circulation is more complicated than this primarily because of the:

A) speed of rotation of Earth.
B) uneven heating of oceans and continents by the Sun.
C) escape of heat outward through Earth's crust.
D) uneven heating of the different atmospheric layers by the Sun.