In the given problem, a basketball rolls to a stop along a gym floor without anyone touching it.
The basketball stops own its own because of the force of friction. Friction is a force which opposes the motion of the object. The direction of the force of friction is in an opposite direction to the motion of the object.
The frictional force will act between the basket ball and the floor.
<h3><em>Frictional forces are exerting force against the basketball, causing it to stop.</em></h3> <h3>If USATestPrep, I think answer choice B is correct </h3>