The statement that best describes the effect of the net force applied to a moving object is:
The force will cause a change in the momentum of the object.
This is because a net force acting on an object will result in an acceleration (according to Newton's second law of motion), which can change the object's velocity (speed and/or direction), and thus change its momentum. While the other options may occur, they are not guaranteed and depend on the specifics of the force applied.