-Which Statement Best Describes the Event Indicated by the Letter

Multiple Choice

-Which statement best describes the event indicated by the letter "C" in Figure 7.1 and how that event is initiated?

A) It is an excitatory potential that causes the relative refractory period.
B) It is a suprathreshold graded potential resulting from the opening and closing of sodium and potassium channels.
C) It is a hyperpolarization of the membrane due to the outward movement of potassium ions.
D) It is a subthreshold graded potential resulting from the opening of sodium channels, closure of potassium channels, or opening of ion channels for sodium and potassium.
E) It is a suprathreshold depolarization representing an action potential.