Explain Why the Propagation of Action Potentials Along Electrically Excitable

Explain why the propagation of action potentials along electrically excitable membranes occurs in only one direction.

A) The refractory period prevents it from propagating back in the direction from which it began.
B) All electrically excitable membranes have two poles,a positive and a negative pole,and the action potential can only travel towards the positive pole.
C) All electrically excitable membranes have two poles,a positive and a negative pole,and the action potential can only travel towards the negative pole.
D) The stimulation of electrically excitable membranes by neurons occurs on only one side of the membrane so it will travel to the other side.
E) The repolarization period prevents it from propagating back in the direction from which it began.