The correct answer to this question is A, Friction. This method of charging happens when two objects rub together. The resistance that occurs when rubbed together works against the motion and will act in a different direction.
Altogether, there are three different types of friction. One is dry friction. This occurs when two solids are touching each other. The next type of friction is rolling friction. This happens when a round surface, rolls over another surface.
Lastly, there is fluid friction. This involves either fluids or air. Overall, friction is important to our everyday. For instance, if you drive, friction is important for the car to brake.