A body moving on a frictionless horizontal surface with some initial velocity encounters a section of rough surface. It takes the body several seconds to traverse the rough section. During this time the momentum of the body will   (A) increase due to the force of friction that supplies an impulse to the body. (B) decrease due to the force of friction that supplies a retarding impulse to the body.     (C) remain constant since the only force acting on the body as it crosses the rough surface is friction. (D) change in both magnitude and direction since the rough surface supplies a force opposite to the direction of motion for some time interval that will reverse its motion.

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