Action Potentials Are Able to Travel Over Long Distances Without

Multiple Choice

Action potentials are able to travel over long distances without decaying because

A) the axons are perfectly insulated,so no current is able to leak out.
B) the action potential uses completely different ions than graded potentials.
C) once the electrical signal has passed threshold,it is impossible for the signal to decay.
D) one action potential generates the next one in an adjacent area of membrane.