Solution: When the "Forward" button on the remote controller is pressed, the rear wheel is a driving wheel that rotates clockwise, so the friction between the armored vehicle and the rear wheel is forward, and the friction between the rear wheel and the armored vehicle is backward; And the front wheel is the driven wheel, so the friction of B car to the front wheel is backward, and the friction of the front wheel to B car is forward. Therefore, car B moves in Xiangqian Che, while car A moves backward.

When the "Back" button on the remote controller is pressed, the rear wheel is a driving wheel that rotates counterclockwise, so the friction between the armored vehicle and the rear wheel is backward, and the friction between the rear wheel and the armored vehicle is forward; The front wheel is still the driven wheel, so the friction between B car and the front wheel is forward, and the friction between the front wheel and B car is backward. Therefore, car B moves backward, while car A moves forward.

Therefore, A and D are wrong and B and C are correct;