Q. Why is it not possible for action potentials in the postsynaptic neuron to produce an action potential in the presynaptic neuron?

(a)The axon terminals of presynaptic neurons have no acetylcholine receptors
(b) the presynaptic neurons do not have a resting membrane potential
(c) The synaptic cleft allows the diffusion of the acetylcholine in the direction only
(d)The synaptic vesicles into the postsynaptic terminal are inactive