What Is the Relationship Between Earth's Mantle and Crust

What is the relationship between Earth's mantle and crust?

A) The crust sits motionless on top of the mantle and does not interact with it.
B) Convection in the mantle moves the continents around, but there is no transfer of material from the mantle to the crust or vice versa.
C) New layers of crust are formed when magma from the mantle flows out over old crust, and this old crust remains as the lowest level of the crust.
D) New crust is formed by magma rising from the mantle in some places, and old crust is pushed back down into the mantle in other places.

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