Final answer:
b. Health psychology is the area of psychology that is most interested in the causation, prevention, and treatment of illness. It focuses on the interplay of biological, psychological, and sociocultural factors and aims to improve health through research, education, and intervention.
Step-by-step explanation:
The area of psychological research that is most interested in the causation, prevention, and treatment of illness is b. Health psychology. Health psychology focuses on how health is affected by the interaction of biological, psychological, and sociocultural factors.
Health psychologists are interested in helping individuals achieve better health through public policy, education, intervention, and research. They may research effective ways to motivate people to address patterns of behavior that contribute to poorer health.