While Observing a Synaptic End Bulb, the Investigator Sees a Decrease

Multiple Choice

While observing a synaptic end bulb, the investigator sees a decrease in the amount of neurotransmitter in the end bulb when the cell is stimulated, but then shortly thereafter, discovers that the amount of neurotransmitter in the cell seems to be increasing. One could hypothesize that the neurotransmitter is removed from this synapse by

A) diffusion
B) enzymatic degradation
C) reuptake by the neuron
D) uptake by glial cells