The correct option is C The stone has more inertia than the ball.
Inertia is the tendency of all objects to resist any change in the state of rest or motion. Mass is a measure of inertia. The more the mass, the more is the inertia.
The mass of a stone is more than the mass of a plastic ball of the same size. Hence, the inertia of the stone is greater than that of the plastic ball.