Question

Medal and fan! Need answer quickly plz!
At a synapse , adequate stimulation causes the presynaptic cell to release which of the following?

a. action potentials that bind to receptors on the postsynaptic cell
b. neurotransmitter that bind to axons on the postsynaptic cell
c. action potentials that bind to axons on the postsynaptic cell
d. neurotransmitters that bind to receptors on the postsynaptic cell