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The answer to this question is letter  B. Convection.

>Mantle's convection is thought to make up about eighty percent of the internal heat flow to the surface, while the remainder originates in the crust.
>The main means of heat transfer is convection. This  process requires that the substance can behave like a "fluid", and the earth's mantle does.
MelodyInTheSea

The answer is

B

Convection currents raise the less dense hot material from the center to the cool crust and material from the cool (dense) crust settles down to the core to be heated again.


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