[单选题]
The diagram shows a prw :kad .o tiyub:3v80nocesh-qch qsrn1z 3:( o mu8c4xe5gs that occurs in the membranes of neurons during a stage of the action poteqh 8(5z -o43 :ucr eqnshcx1gmntial. What process does the diagram depict?
A. Open sodium channels initiating depolarization.
B. The sodium/potassium pump initiating depolarization.
C. Open sodium channels restoring the resting potential.
D. The sodium/potassium pump restoring the resting potential.
