A Pool Ball Moving at 3 M/s Collides Head- on with an Identical

A pool ball moving at 3 m/s collides head- on with an identical pool ball that's initially at rest. Just after the collision, the second ball moves away at 2 m/s while the first ball

A) moves at 3 m/s in a direction opposite to the second ball.
B) moves at 1 m/s in the same direction as the second ball.
C) is at rest.
D) continues moving at 3 m/s in the same direction.
E) moves at 1 m/s in a direction opposite to the second ball.