Practice mode Critical Reasoning

Argument: Brand X toothpaste reduces tooth decay, because people who use it visit the dentist less often. Which of the following, if true, most weakens the argument?

Correct answer A. Brand X is sold mostly in areas with very few dentists

Explanation

If users live where dentists are scarce, they visit less often because of access, not healthier teeth. This offers another explanation for the fewer visits and weakens the argument.

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Answer checked 11 October 2026 How we write and check questions

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Argument: Brand X toothpaste reduces tooth decay, because people who use it visit the dentist less often. Which of the following, if true, most weakens the argument?

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Argument: Brand X toothpaste reduces tooth decay, because people who use it visit the dentist less often. Which of the following, if true, most weakens the argument?

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