What Do Studies on Diet, Exercise, and Obesity Suggest with Respect

What do studies on diet, exercise, and obesity suggest with respect to heart disease?

A) Diet and physical activity have little effect on an individual's likelihood of developing heart disease.
B) Changing one's eating habits toward a diet low in saturated fat can reduce the risk of developing heart disease.
C) Obesity is the result of individual choices and relates little to the development of heart disease.
D) Only lengthy, vigorous physical activity has been shown to provide some protection against heart disease.
E) None of the above.