After a Signal Has Been Transmitted to a Receiving Cell,neurotransmitters

After a signal has been transmitted to a receiving cell,neurotransmitters are rapidly removed from the synaptic cleft because

A) if even one neurotransmitter escapes from the synaptic cleft,it will produce action potentials in other neurons.
B) if neurotransmitters are not removed,they will enter the receiving cell and stimulate action potentials in organelle membranes.
C) neurotransmitters that remain in the synaptic cleft continue to bind to receptors in the receiving cell,potentially initiating new action potentials.
D) making neurotransmitters from scratch is energetically expensive,so the cell must recycle them.