Newton's First Law of Motion states that an object in motion tends to stay in motion unless it

A

starts to decelerate.

B

runs out of kinetic energy.

с

is acted upon by another force.

D

approaches the speed of light

C. Is acted upon by another force

Explanation:

Newton's First Law of Motion states that an object in motion tends to stay in motion unless is acted upon by another force. If, for example, I roll a marble, it tends to stay in motion, until friction (a force) acts on it. Therefore, a force must act on an object that is in motion in order to stop it.

Your answer is C.

Explanation:

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.