单选题:短期总供给曲线向右上方倾斜,该曲线变为一条垂线的条件是(  )。

题目内容:
短期总供给曲线向右上方倾斜,该曲线变为一条垂线的条件是(  )。 A.经济中实现了充分就业
B.通货膨胀率为零
C.物价水平保持稳定
D.总供给受到了资源和其他因素的制约

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