Figure 12-2 The Nerve Action Potential

Use Figure 12-2 to answer the following questions:
-What is occurring at the area labeled #4?

A) An inhibitory stimulus has occurred.
B) Chemically gated potassium channels have opened.
C) Excessive potassium has diffused out causing hyperpolarization.
D) Sodium ions have been pumped out of the neuron.
E) Excessive depolarization of the axon has occurred.