Which of the Following Research Studies Would Determine the Attributable

Which of the following research studies would determine the attributable risk of a sedentary lifestyle in cardiac disease?

A) Measuring all cases of cardiac problems in a specific community
B) Comparing the number of persons with cardiac disease among athletes with the number among nonathletes in a community
C) Subtracting the rate of cardiac disease among athletes from the rate of cardiac disease among nonathletes
D) Calculating the relative risk and then subtracting the attack rate to determine the attributable risk