Question

what is the most likely cause of plate movement?
cold air currents on earths surface
radiation from the sun
movement of ice sheets
heat convection within the earth

Explanation:

Plate movement is related to the dynamics within the Earth. Cold air currents (surface), solar radiation, and ice sheet movement are surface or external factors, not internal Earth processes driving plate tectonics. Heat convection in the Earth's mantle (internal heat - driven movement of molten rock) is the main mechanism for plate movement.

Answer:

D. heat convection within the earth