Depolarization of the Neuron Occurs When

Depolarization of the neuron occurs when

A) the potassium gates open and potassium moves outside the cell.
B) the sodium-potassium pump moves sodium inside the cell.
C) sodium gates open and sodium moves inside the cell.
D) the sodium-potassium pumps moves potassium inside the cell.
E) water moves to the outside of the cell and chloride ions follow.