IMO B, To seriously weaken the argument we need to prove that the people who discontinued exercise are not lounging around.
People who discontinue regular exercise typically claim that exercising amounted to wasted time for them. But this claim is born of laziness, in light of the overwhelming evidence that regular exercise improves one’s health.
Which of the following statements, if true, would most seriously weaken the argument above?
(A) Exercise has been shown to not only improve one’s health, but also to increase longevity, or life span. --> out of scope, we do not care about the benefits of exercise.
(B) People who have discontinued regular exercise now make productive use of the time they formerly devoted to exercise. --> this proves that people who discontinued exercise are not lazy instead they are being productive at the time earlier allotted for exercise.
(C) People who are in good health are more likely to exercise regularly than people who are in poor health.--> out of scope
(D) A person need not exercise every day to experience improved health from the exercise.--> we don't care about the benefits
(E) People who are in poor health are less likely to exercise than other people.--> we don't care about the their lifestyle.