In a Neuron,what Happens When an Action Potential Reaches the Axon

Multiple Choice

In a neuron,what happens when an action potential reaches the axon terminals of the neuron?

A) Since neurons touch one another,the action potential simply travels to an adjoining neuron.
B) The action potential stimulates the release of chemical substances.
C) The impulse changes direction,heading back to the cell body.
D) An electrical spark forms,which may jump to other neurons.