[单选题]下列矩阵中不是初等方阵的是（） A <img src="data:image/png;base64,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"> B <img src="data:image/png;base64,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" class="w-e-selected"> C <img src="data:image/png;base64,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"> D <img src="data:image/png;base64,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" class="">