Studies have shown that specialty sports foods contain exactly the same nutrients in the same quantities as do common foods from the grocery store. Moreover, sports foods cost from two to three times more than regular foods. So were it not for expensive advertising campaigns.
What this question is testing
Your task
Find the choice that makes the argument's conclusion less likely to be true.
Common trap
Answers that look negative but attack a claim the argument never relied on.
Winning move
Find the assumption the argument depends on, then pick the choice that undermines it.
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