Which One of the Following Happens During Repolarization of a Neuron

Multiple Choice

Which one of the following happens during repolarization of a neuron?

A) Sodium channels close, and potassium rushes out of the cell to temporarily reestablish the membrane potential.
B) Potassium channels close, preventing further loss of positive ions.
C) The sodium-potassium pump is turned off.
D) Sodium channels open to allow sodium ions to rush back out of the cell.
E) The membrane potential is eliminated.