An Object of Mass M Is Attached to String of Length

Multiple Choice

An object of mass m is attached to string of length L.When it is released from point A,the object oscillates between points A and B.Which statement about the system consisting of the pendulum and the Earth is correct?

A) The gravitational potential energy of the system is greatest at A and B.
B) The kinetic energy of mass m is greatest at point O.
C) The greatest rate of change of momentum occurs at A and B.
D) All of the above are correct.
E) Only (a) and (b) above are correct.