Purebred dogs are prone to genetically determined abnormalities. Although such abnormalities often can be corrected by surgery, the cost can reach several thousand dollars. Since nonpurebred dogs rarely suffer from genetically determined abnormalities, potential dog owners who want to reduce the risk pets would be well advised to choose nonpurebred dogs.
What this question is testing
Your task
Find the choice that makes the argument's conclusion less likely to be true.
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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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