A Pendulum with a Mass M Swings and Picks Up

Multiple Choice

A pendulum with a mass M swings and picks up a piece of clay of mass m at the bottom of its swing.

A) It rises to the same height after the collision as before.
B) The total mechanical energy of the system is unchanged by the collision.
C) If M = m,then the height it reaches after the collision is half that before the collision.
D) If M = m,then the height it reaches after the collision is 1/4 that before the collision.
E) If M = m,then it rises to twice the height it had before the collision.