Action and Graded Potentials Both Use Local Current Flow, but Action

Multiple Choice

Action and graded potentials both use local current flow, but action potentials can travel long distances while graded potentials decay. How is this possible?

A) Graded potentials only use Na⁺ and K⁺, while action potentials use other ions.
B) Action potentials are regenerated as they travel along the axon.
C) Refractory periods allow the channels to rest between action potentials so that they can travel a longer distance.
D) Myelin prevents all charges from leaking out of the axon.