Frictional forces oppose the motion of the car. Forward motion slowly runs out as energy is expended. The natural state of an object is to be at rest. Inertia acting on an object will dissipate.
I gave my students this multiple choice question: Which statement best explains why a car that is rolling on a level surface will eventually come to a stop?

Only one answer is correct among these 4 choices:
- Frictional forces oppose the motion of the car.
- Forward motion slowly runs out as energy is expended.
- The natural state of an object is to be at rest.
- Inertia acting on an object will dissipate.

Could you tell me which one is correct?

Frictional forces oppose the motion of the car.