The correct answer is C. Sections 1 and 4.
In sections 1 and 4, the ball is moving at a constant speed. This means that the net force acting on the ball is zero, or that the forces acting on the ball are balanced.
In sections 2, 3, and 5, the ball is accelerating. This means that the net force acting on the ball is non-zero, or that the forces acting on the ball are unbalanced.
In section 1, the ball is moving to the right at a constant speed. The only force acting on the ball is the weight of the ball, which acts downwards. The normal force from the surface counteracts the weight of the ball, so the net force is zero.
In section 2, the ball is accelerating to the right. This means that the net force acting on the ball is to the right. This net force is caused by the normal force from the surface, which is slightly larger than the weight of the ball.
In section 3, the ball is still accelerating to the right. The net force acting on the ball is still to the right, but it is smaller than in section 2 because the ball is moving faster.
In section 4, the ball is moving at a constant speed to the right. The net force acting on the ball is zero, or that the forces acting on the ball are balanced.
In section 5, the ball is decelerating to the right. This means that the net force acting on the ball is to the left. This net force is caused by the normal force from the surface, which is slightly smaller than the weight of the ball.
Therefore, the only sections where the ball is subjected to a balanced force are sections 1 and 4.