According to the Text, the Chemicals That Make Up Neurotransmitters

According to the text, the chemicals that make up neurotransmitters are also important in determining the neurotransmitters' specific behavioral expression. An example of this is

A) monoamine oxidase's breakdown of neurotransmitters such as dopamine and serotonin.
B) endorphin inhibition due to levels of certain other hormones.
C) the length of the neurotransmitter's axon determining the strength of its expression.
D) the blood oxygen level dependent (BOLD) affecting the speed of any neural impulse.