Car a Rear Ends Car B, Which Has Twice the Mass

Multiple Choice

Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision

A) each car has half the momentum.
B) car A stops and car B has momentum mv.
C) car A stops and car B has momentum 2mv.
D) the momentum of car B is four times as great in magnitude as that of car A.
E) each car has half of the kinetic energy.