The correct statement regarding the relationship between the net force and the ball's movement is:
The net force causes a decrease in acceleration because without the force the ball's velocity would remain the same.
In this case, a nonzero net force is acting opposite to the direction of the ball's motion, causing it to decelerate and come to a stop. According to Newton's second law (F = ma), if there is a net force acting on an object, it will cause an acceleration in the direction of the net force. When the ball's velocity is decreasing, we can say that the acceleration is negative (deceleration), meaning the net force is acting in the opposite direction to the ball's motion.