Answer:
C. lithosphere
Step-by-step explanation:
Lithosphere -
On the surface of the planet Earth , the lithosphere , comprises of the portion of the Earth's crust and the upper mantle region .
The word lithosphere is composed of two words lithos and sphere , where the meaning of lithos is rocky .
The layer present exactly under the layer of lithosphere is known as the asthenosphere .
The plates of lithosphere are made up of light weight rock , due to which the plates float of the top of the denser material .