Because addictive drugs are physically harmful, their use by athletes is never justified. Purists, however, claim that taking massive doses of even such nonaddictive drugs as aspirin and vitamins before competing should also be prohibited because they are unnatural. This is ridiculous; almost everything in sports is unnatural, from high-tech running shoes unnecessary deaths and injuries. Therefore, the use of nonaddictive drugs by athletes should not be prohibited.
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.
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Find the assumption the argument depends on, then pick the choice that undermines it.
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