Suppose that in the cohort study on smoking and lung cancer, the attributable proportion among the exposed had been 79%. Which of the following would be the best interpretation of this result?

a. Non-smokers have 79% less lung cancer

b. Smokers have 79% more lung cancer

c. 79% of all lung cancers in the population are attributable to smoking

d.79% of the lung cancers occurring in smokers can be attributed to their smoking