When the Neurotransmitter Is Released to a Neuron, What Happens

When the neurotransmitter is released to a neuron, what happens?

A) It binds to the membrane of the neuron, triggering an action potential where positive ions can rush into the cell.
B) It changes the external charge of the neuron from positive to negative, triggering an action potential and nerve impulse.
C) It causes the heart rate to increase.
D) It enters into the synaptic space and triggers negative ions to bind with the cell membrane, allowing an action potential.
E) It binds to the dendrites on a neuron, triggering an action potential that travels up the axon to the next cell.