A Proton and an Electron Are Released from Rest,with Only

Multiple Choice

A proton and an electron are released from rest,with only the electrostatic forces being exerted.Which of the following statements must be true about them as they move toward each other? (There could be more than one correct choice.)

A) The electric potential energy of the system proton-electron keeps increasing.
B) Their kinetic energy keeps increasing.
C) The electric potential energy of the system proton-electron keeps decreasing.
D) Their kinetic energy keeps decreasing.
E) Their acceleration keeps decreasing.