The best statement that describes the effect of the applied net force on a moving object is: The force will cause a change in the momentum of the object.
This statement is accurate because, according to Newton's second law, a net force acting on an object results in an acceleration, which changes the object's velocity. Since momentum is the product of mass and velocity (momentum = mass × velocity), any change in velocity (whether in magnitude or direction) will result in a change in momentum.