The response that best demonstrates Newton's third law in the context of bumper cars is:
If two bumper cars collide with a certain force, then they will move away from each other in opposite directions with the same force.
This statement reflects Newton's third law, which states that for every action, there is an equal and opposite reaction. When the two bumper cars collide, each car exerts a force on the other, resulting in them moving apart in opposite directions. The forces they exert on each other are equal in magnitude and opposite in direction.