Why Isn't an Action Potential Transmitted from a Postsynaptic Membrane

Multiple Choice

Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?

A) Presynaptic terminals have no acetylcholine receptors.
B) Presynaptic neurons do not have a resting membrane potential.
C) Acetylcholine can only diffuse in one direction across the synaptic cleft.
D) Synaptic vesicles in the postsynaptic membrane are inactive.
E) Acetylcholine is destroyed too quickly.