Answer:
D) It causes the object to slow down or stop..
Step-by-step explanation:
Friction is a force, Ff, that operates in the opposite direction of an object's motion.
Force = Mass x Acceleration.
Once an object has been acted upon by a force, F, it will accelerate for however long the force is applied. If we assume a positive, horizontal force (along the x axis), the object will accelerate for however long the force is applied.
Friction will be subtracted from the positive force to yield a net force: F - Ff. This will reduce the acceleration and, if large enough, could eventually bring the object to rest, if the original positive force is removed.