A Nerve Cell Body Is Able to Depolarize Within Only

A nerve cell body is able to depolarize within only one millisecond because,when the threshold potential is reached,

A) the entire length of the membrane is affected at once.
B) large numbers of voltage-gated K⁺ channels open very quickly.
C) large numbers of voltage-gated Na⁺ channels open very quickly.
D) only a very small electrical change is needed to reverse polarity.
E) only a single signal is usually required to cause depolarization.