What is the difference between inertia and gravity?

A.
Inertia is an object's ability to change its motion, including a change in direction. Gravity is the force that pushes a body away from any other physical body having mass.

B.
Inertia is an object's ability to change its motion, including a change in direction. Gravity is the force that attracts a body toward any other physical body having mass.

C.
Inertia is an object's resistance to any change in its motion, including a change in direction. Gravity is the force that pushes a body away from any other physical body having mass.

D.
Inertia is an object's resistance to any change in its motion, including a change in direction. Gravity is the force that attracts a body toward any other physical body having mass.