[单选题]
The diagram shows a process that occurs in the membranes om+)2d8x3arm zh8fm xzf neurons du5fuly.bzrqe6ojoqrk,n* m / k8 .9iw-ring a stage of the action potential. What process does the diagram depiolq6qmn-i/ *r b.f.o 5,jze8uk9rkywct?
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.
