单选题：关于行业竞争结构特征的说法，错误的是（　　）。

题目内容：
关于行业竞争结构特征的说法，错误的是（　　）。 A．完全竞争结构有一些公司
B．寡头垄断结构进入和退出障碍明显
C．双头垄断结构可能有潜在的产品差异
D．完全垄断结构信息不能完全获得

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答案解析：

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