Argument: Residents of Riverside are healthier than residents of Hillside because Riverside has more gyms. Which of the following, if true, most weakens the argument?
Correct answer D. Riverside residents are, on average, much younger than Hillside residents
Explanation
Younger people tend to be healthier, so age could explain the difference instead of gyms. The other options say nothing that challenges the link between gyms and health.
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