A cart is pulled by a horse. According to Newton’s 3rd Law, the horse is also pulled by the cart with the same force and they cancel. How does motion occur? A. The cart actually pushes the horse.

B. The horse pushes on the Earth, so the Earth pushes on the horse. The Earth is way more massive than the horse, so the horse has more acceleration.

C. None of these.

D. The horse pulls on the cart with a little more force than the cart pulls on the horse.