[" An "wattomobile that is towing a trailer is "],[" accelerating on a level road.The force that "],[" the automobile exerts on the trailer is "],[" 1) equal to the force the trailer exerts on the "],[" a) greater than the force the trailer exerts on the "],[" automobile "],[" 3) equal to the force the trailer exerts on the roadd "],[" 4) equal to the force the road exerts on the trailer "]