Two Protons Are Fired Toward Each Other in a Particle

Multiple Choice

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