Correct answer choice is :
D) GABA (gamma-aminobutyric acid)
Step-by-step explanation:
Presynaptic neurons are the neurons that carry the AP to deliver a neurotransmitter and they change the postsynaptic neurons. What ALWAYS makes a neuron to deliver any neurotransmitter is an energy potential. Because of this part of the GABA carrier receptor, GABA is listed as an inhibitory neurotransmitter, as exposed to excitatory neurotransmitters, such as glutamate, which increase the resolution pulses in the neuron.