Two Cars of Equal Mass Travel in Opposite Directions at Equal

Multiple Choice

Two cars of equal mass travel in opposite directions at equal speeds.They collide in a perfectly inelastic collision.Just after the collision,their velocities are

A) zero.
B) equal to their original velocities.
C) equal in magnitude but opposite in direction to their original velocities.
D) less in magnitude and in the same direction as their original velocities.
E) less in magnitude and opposite in direction to their original velocities.