Which of the Following Events Restores the Membrane Potential from the Peak

Multiple Choice

Which of the following events restores the membrane potential from the peak of the action potential back down to the resting level?

A) Sodium ions move into the cell.
B) Potassium ions move out of the cell.
C) Potassium ions move into the cell.
D) Chloride ions move into the cell.
E) Protein anions move out of the cell.