An enzyme deficiency that lowers the rate at which a person's muscles perform anaerobic respiration will likely reduce the power of

I think it's fast twitch fibers, others will say myosin, but when I took the quiz, it marked myosin wrong

(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!