Final answer:
Dr. Hernandez would describe herself as a neuroscientist because she is studying neurotransmitter abnormalities in depressed patients.
Step-by-step explanation:
The correct answer is D) Neuroscientist.
Dr. Hernandez, based on her study of neurotransmitter abnormalities in depressed patients, would describe herself as a neuroscientist. Neuroscientists specialize in studying the structure and function of the nervous system, including the brain and its neurotransmitters.