Two friends are standing on opposite ends of a canoe. The canoe is at rest with respect to the lake. Then the friend at the north end of the canoe throws a very massive ball to the friend at the south end of the canoe, who catches it. How does the canoe move, if at all, as a result? A. The canoe accelerates to the south. B.The canoe remains motionless. C. The canoe accelerates to the north