The Following Are Steps Involved in Transmission at the Cholinergic

The following are steps involved in transmission at the cholinergic synapse:
1) Chemically regulated ion channels on the postsynaptic membrane are activated.
2) Calcium ions enter the axon terminal.
3) An action potential depolarizes the axon terminal at the presynaptic membrane.
4) Acetylcholine is released from storage vesicles by exocytosis.
5) Acetylcholine binds to receptors on the postsynaptic membrane.
The correct sequence for these events is

A) 4, 2, 1, 5, 3.
B) 3, 2, 4, 5, 1.
C) 2, 4, 1, 3, 5.
D) 2, 5, 4, 1, 3.
E) 1, 2, 3, 4, 5.