I'll give you a question, please answer with step-by-step reasoning process.
Of the following two sentences, which one is against common sense?\nOptions:\n- Sentence A: "People can travel by bird."\n- Sentence B: "People can travel by horse."\n

Sentence A
People cannot travel by bird because no bird can hold the weight of a human on its back whilst flying.

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Therefore, the answer is Sentence A