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设某商品的需求函数为<img align="middle" alt="" src="/api/uploads/60000061731/in-rich-contentcreated_at=1648696590">，则需求弹性<img align="middle" alt="" src="/api/uploads/60000061732/in-rich-contentcreated_at=1648696590">（　）.(单选题)
.<img align="middle" alt="" src="/api/uploads/60000061733/in-rich-contentcreated_at=1648696590">
.<img align="middle" alt="" src="/api/uploads/60000061734/in-rich-contentcreated_at=1648696590">
.<img align="middle" alt="" src="/api/uploads/60000061735/in-rich-contentcreated_at=1648696590">
.<img align="middle" alt="" src="/api/uploads/60000061736/in-rich-contentcreated_at=1648696590">

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出自：2024年国家开放大学答案

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