According to the theory of plate tectonics, the
a. asthenosphere is divided into plates.
b. lithosphere is divided into plates.
c. asthenosphere moves over the lithosphere.
d. asthenosphere is strong and rigid.

B. lithosphere is divided into plates.

Explanation:

The theory of plate tectonics involves the splitting apart of the earth large lithosphere into sub parts when are called as plates. These plates are said to be glided over the hot mantle (the inner rocky layer above the core) due to the internal disturbance. These plates where expected to be like hard and rigid shells.