Which of the following statements about the action potential is false?

A) The rapid depolarization phase is caused by the entry of potassium ions.
B) During the repolarization phase, sodium channels close and potassium channels open.
C) During the depolarization phase, membrane potential becomes positive.
D) During the hyperpolarization phase, the ion pumps re-establish the sodium and potassium concentrations across the cell membrane.
E) Repolarization occurs as potassium ions leave the axon.