To revolve means to a. keep completely still b. move around another object c. preserve or save something d. spin around in one place

B, move around another object.

The correct answer would be the second choice, B. move around another object.
To revolve means to move around another object. The other choices are not correct, except for D, which is somewhat true, but not completely. 

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;