Which statement best reflects MAOA gene-environment interaction in aggression?

Which statement best reflects MAOA gene-environment interaction in aggression?

• A. The MAOA gene variant by itself dictates aggressive behavior.
• B. There is no interaction between gene and environment.
• C. A high-activity MAOA variant with maltreatment increases aggression more than other combinations.
• D. The interaction between MAOA variant and childhood maltreatment increases aggression risk.

Answer: (D)