Answer:
Answer C: There is a net force on the ball
Step-by-step explanation:
Newton's first law of motion says that:
"very object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force."
For an object to change its state of motion, a force must be applied, and since the ball is changing its state of motion (it is slowing down - its speed is being reduced - its uniform motion is being changed), we can affirm that there must be a net force applied to it.
Therefore, answer C: "There is a net force on the ball" is the correct answer.