Which of the following is a behavioral risk factor?

• A. Obesity
• B. Occupation
• C. Air pollution levels
• D. Vaccination status

Answer: (D)

Behavioral risk factors are actions people take that can change their likelihood of developing or spreading disease. They are modifiable through choices and everyday actions, such as smoking, physical activity, diet, or choosing to vaccinate.

Vaccination status fits this idea because it reflects a personal health decision to receive vaccines. Whether someone is vaccinated or not directly affects their risk for vaccine-preventable diseases, making vaccination status a behavioral risk factor. If a person is not vaccinated, their risk is higher, illustrating how a behavior influences risk.

Obesity is a physiological/metabolic condition rather than a behavior in itself, though it can be influenced by behavior. Occupation describes a workplace role and associated exposures rather than a personal behavior. Air pollution levels are environmental exposures outside individual control. Those distinctions help show why vaccination status is the behavioral factor in this set.