Rotation is the spin of a body on its axis. Revolution is the movement of one body around another in an ellipse-shaped path called an orbit. Earth rotates on its axis and revolves around the Sun. The moon rotates on its axis and revolves around Earth.

Rotation is the circular movement of an objector planet around a center of rotation. The 3D objects like earth, moon and other planets always rotate around an imaginary line which is called the  rotation axis. If the axis passes through the body’s center of mass, the body is said to rotate upon itself or spin.

Revolution is referred to as an orbital revolution. It happens when one body moves around another, while rotation is used to mean the movement around the axis like Moon revolving around the Earth and  Earth revolving around the Sun.

fe 55.85 g/mol and h2o 18.02 g/mol.

i think that the answer is c