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下图所示结构弯矩图的正确形状是（ ）
<img alt="" height="121" src="https://lms.ouchn.cn:443/api/uploads/733412/in-rich-contentcreated_at=1628846723" style="vertical-align: middle; display: block; margin-left: auto;" width="127">(单选题)
.<img alt="" height="103" src="https://lms.ouchn.cn:443/api/uploads/733413/in-rich-contentcreated_at=1628846723" width="113">
.<img alt="" height="103" src="https://lms.ouchn.cn:443/api/uploads/733414/in-rich-contentcreated_at=1628846723" width="113">
.<img alt="" height="103" src="https://lms.ouchn.cn:443/api/uploads/733415/in-rich-contentcreated_at=1628846723" width="113">
.<img alt="" height="97" src="https://lms.ouchn.cn:443/api/uploads/733416/in-rich-contentcreated_at=1628846723" width="116">

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出自：2024年国家开放大学答案

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