A study on diabetes begins with 1000, 40 to 45-year-old men, of which 60 are already diabetic. The remaining 940 men are followed for 5 years, during which time 75 men develop diabetes. Calculate the 5-year risk of having diabetes.
a. 4.5%
b. 8.5%
c. 7.5%
d. 6.0%