Which of the Following Is a Direct Result of Depolarizing

Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal?

A) Voltage-gated calcium channels in the membrane open.
B) Synaptic vesicles fuse with the membrane.
C) The postsynaptic cell produces an action potential.
D) Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.
E) An excitatory postsynaptic potential (EPSP) or inhibitory postsynaptic potential (IPSP) is generated in the postsynaptic cell.