Which Sequence Presents Presynaptic Events in the Correct Chronological Order $\rightarrow$

Which sequence presents presynaptic events in the correct chronological order?

A) Calcium ion influx $\rightarrow$ action potential reaches axon terminal $\rightarrow$ vesicle fuses with membrane $\rightarrow$ diffusion of neurotransmitter
B) Exocytosis $\rightarrow$ calcium ion influx $\rightarrow$ action potential reaches axon terminal $\rightarrow$ membrane depolarization
C) Action potential reaches axon terminal $\rightarrow$ calcium ion channels open $\rightarrow$ exocytosis $\rightarrow$ diffusion of neurotransmitter
D) Action potential reaches axon terminal $\rightarrow$ calcium ion channels open $\rightarrow$ neurotransmitter diffusion $\rightarrow$ exocytosis