How can friends best counteract the negative influence of peer pressure? by being assertive
by being supportive of positive behaviors
by being humorous
by being quiet and submissive

B.supportive of positive behaviors, you want the positive answer, remember your counteracting the negative position

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(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!