The third line of defense fights disease by O providing a physical barrier against pathogens.
attacking each pathogen it encounters in the same manner.
O producing a fever to raise the body temperature making it inhabitable to pathogens.
O producing a specific and unique response for each kind of pathogen it encounters.

Answer compression tablet;

(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!