Health care standards recommend scales be precise to one pound per 150 pounds of weight to ensure accurate dosing and treatment.

Its simple its a because they are more fat

Answer (185 billion dollars).

(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!