Which of the following describes the layer directly beneath the Earth's lithospheric plates? A.
It does not move.

B.
It moves very slowly, and it moves in only one direction around the Earth.

C.
It moves very slowly, and it moves in different directions in different places.

D.
It moves very rapidly, and it moves in different directions in different places.

I believe it's C.

Explanation:

The mantle underneath the plates moves in a circular way (Convection Currents). That is why plates move.

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.