Which type of risk factor is most influential on health?

• A. Primary
• B. Secondary
• C. A factor with the greatest influence on health
• D. A factor that cannot be changed

Answer: (C)

This question asks you to compare how much different risk factors influence health. The best choice is the one that literally describes the factor with the largest impact on health outcomes. In health science, we think about how strongly a risk factor changes the likelihood of disease or poor health across people, often talking in terms of effect size or population impact. The option that states “a factor with the greatest influence on health” directly communicates that idea of magnitude, which is what the question is asking for.

The other descriptions don’t address how powerful the influence is. Labeling something as primary or secondary describes its relationship or order among factors, not how strongly it affects health. Describing a factor as unchangeable focuses on whether it can be changed, rather than how much it affects health. So the option naming the greatest influence best matches the idea being asked.