What is the death rate of yellow fever? ?

Yellow fever has occurred in unvaccinated travelers. During 1970–2002, 9 cases were reported in unimmunized travelers from the United States and Europe; disease was acquired in Brazil (3 cases), Senegal (2 cases), Venezuela, Ivory Coast, the Gambia, and West Africa. Mortality rate was 89%.

(a) is not correct because one does not get increased cholesterol  from lifting weights.(b) is not correct because lifting weights cannot reduce the risk of a hereditary disease.(c) is not correct because back pain isn't a benefit! and plus, if he lifts weights properly, he should not have back pain.(d) is the correct answer because his ligaments will gain mass, making it easier for him to carry heavier weights and he will also be stronger!