Biopsychology has found clear evidence of a biological cause for

• A. schizophrenia.
• B. bulimia nervosa.
• C. phobias.
• D. repression.

Answer: (A)

Verified step by step guidance

1. Understand the context of biopsychology, which studies the biological underpinnings of behavior and mental processes.
2. Identify the mental disorders listed: schizophrenia, bulimia nervosa, phobias, and repression.
3. Research the biological causes associated with each disorder. For example, schizophrenia has been linked to genetic factors, neurotransmitter imbalances, and brain structure abnormalities.
4. Compare the strength of biological evidence for each disorder. Schizophrenia is well-documented in biopsychology for having a strong biological basis.
5. Conclude that among the options, schizophrenia is the disorder with the most clear and established biological cause according to biopsychological research.