What Would a Person Have If a Biochemical Imbalance Were

What would a person have if a biochemical imbalance were the cause of that person's depression?

A) an abnormality in the activity of certain neurotransmitters,especially serotonin and norepinephrine
B) especially high levels of the neurotransmitters dopamine and acetylcholine and their metabolites
C) particularly low levels of the neurotransmitters cortisol and melatonin,as measured by their metabolites
D) an absence of the neurotransmitters cortisol and serotonin