hey there ! the answer is gonna be b. you got this babe <333!
This is true to an extent but also false. It can be an offgaurd pic or it can be a deep in mind pic.
Answer:
convection currents of rock move the plates its like a soup the cold soup part sinks to heat up near the heating plate and rises once its hotter than the rest of the soup to cool down because its further away from the heat source and this also happens in the mantle