When a Photon Collides with a Free Electron at Rest

Multiple Choice

When a photon collides with a free electron at rest and the direction of motion of the photon changes,

A) the magnitude of the momentum of the photon does not change.
B) the momentum of the electron does not change.
C) the kinetic energy of the electron does not change.
D) the total energy of the photon does not change.
E) both the magnitude of the momentum and the total energy of the photon decrease.