Which process provides nearly all of the force that drives the movements of the Earth's tectonic plates?

Question

A. the combined gravitational pulls of the Sun and the Moon
B. the centripetal force from teh Earth's rotation
C. the combination of wind and wave action
D. the convection currents in the Earth's mantle

Answer 1

Through out my geologic education I was always taught that it is the convection currents in the Earth's mantle.

To reply to the other answer: Molten rock is not lava until it is on the Earth's surface. Until then it is called magma.

Answer 2

The main force is the heat and movement of the melted lava inside the earth shell this huge energy in the core drives the slow movement of the tectonic plates can't you see what volcanos burst our?