The answer is C. The endothelium on the inside of the artery.
Sedentary individuals are often lethargic and show early symptoms of obesity. Less exercise means a slower metabolism. A slower metabolism means that even if an individual is eating what they normally should, it will take them a longer time to burn off the calories they gain.
I think it's D. Because the students impulse is to do it because its cool, because all their friends do it. Hope my answer helps you! :)
Drugs/Tobacco.
Alcohol.
Sexual Activity.
Poor Diet.
Behavior that may cause injury.
Sedentary Lifestyle.