The figure below illustrates how a neuron with a myelinated axon transmits signals.
What is happening in Region A of this figure?

A)An action potential is moving between two nodes of Ranvier.
B)Neurotransmitters are rapidly diffusing between two nodes of Ranvier.
C)An electric charge is moving rapidly between two nodes of Ranvier.
D)Myelin is carrying sodium ions between two nodes of Ranvier.