Adam’s dog, a golden retriever named Hans, can respond to over 150 different commands. Adam cites this fact as evidence for his claim that Hans can understand the English language.Which of the following, if true, casts the most doubt on Adam’s claim that Hans can understand the English language?

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Adam’s dog, a golden retriever named Hans, can respond to over 150 different commands. Adam cites this fact as evidence for his claim that Hans can understand the English language.<br>Which of the following, if true, casts the most doubt on Adam’s claim that Hans can understand the English language?