What Accounts for the Sensitization of the Gill-Withdrawal Reflex in Aplysia

Multiple Choice

What accounts for the sensitization of the gill-withdrawal reflex in aplysia?

A) Motor neurons release serotonin,which increases the number of vesicles available to release glutamate from the sensory neuron.
B) Motor neurons release glutamate,which increases the number of vesicles available to release serotonin from the interneurons.
C) Interneurons release serotonin,which increases the number of vesicles available to release glutamate from the sensory neuron.
D) Interneurons release glutamate,which increases the number of vesicles available to release serotonin from the sensory neuron.