The Duration of ACh Activity at Postsynaptic Receptor Sites Is

The duration of ACh activity at postsynaptic receptor sites is limited by

A) a high concentration of AChE in the synaptic cleft.
B) a high concentration of intracellular AChE in the presnaptic terminal.
C) a large number of reuptake receptors on the pre-synaptic membrane.
D) the proximity of glial cells that absorb the ACh .
E) the size of vesicles released from the presynaptic terminal.