Which of the following best describes the process that causes the movement of the Earth's surface plates?

A.
Earthquakes cause the plates to move.
B.
The effect of the earth revolving causes currents within the mantle.
C.
Heating and cooling within the mantle cause convection currents.
D.
The mantle is a liquid and the plates float.
E.
Oceans push against the continents causing them to move.