In the table below, percentages are probabilities of 15-year survival without coronary heart disease, stroke, or diabetes in men aged 50 years with selected combinations of risk factors. Here "BMI" stands for body mass index, an index of weight adjusted for height. The World Health Organization gives the following classifications: "normal" 18.5 to 24.9; "grade 1overweight" 25.0 to 29.9; "grade 2 overweight" 30.0 to 39.9; "grade 3 overweight" 40.0 or higher.
A man who currently smokes and who is very overweight and inactive is considering either starting an exercise program or dieting to lose enough weight to be somewhat overweight—but not both. According to the table, which choice would be better?
A.)exercise program
B.) dieting