Answer:B Inertia
Explanation:
Inertia is the tendency of a body to remain at present state or remain unchanged unless a force is acted upon it.
for example, if a body is moving with linear velocity in a straight line then the inertia allows the body to move in a straight line unless a force like the friction of any other external force to stop it.
Rolling of a ball down the inclined plane continuously until friction is applied.