The Nurse Is Caring for a Client Presenting with Mood

The nurse is caring for a client presenting with mood and behavioral problems. Which physiological reason does the nurse identify as the cause of the client's problems?

A) The client has reduced catecholamines.
B) The client has reduced serotonin levels.
C) The client has increased levels of dopamine.
D) The client has a gamma amino butyric acid (GABA) deficiency.