This is _____ you are mistakenA what B which C where D that为什么选择C不选择A.是什么从句啊

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This is _____ you are mistaken
A what B which C where D that为什么选择C不选择A.是什么从句啊

you are mistaken
已经有主语了(you)和宾语(mistaken),what一般要做主语或宾语了,所以不行.