Two Protons Are Fired Toward Each Other in a Particle

Two protons are fired toward each other in a particle accelerator,with only the electrostatic force acting.Which of the following statements must be true about them as they move closer together? (There could be more than one correct choice. )

A) Their electric potential energy keeps increasing.
B) Their kinetic energy keeps increasing.
C) Their electric potential energy keeps decreasing.
D) Their kinetic energy keeps decreasing.
E) Their acceleration keeps decreasing.