帮我看看这句英文,选哪一个?为什么?He has four dogs,the biggest-----is called WangWang.A.that B about which C.of which D.which

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帮我看看这句英文,选哪一个?为什么?
He has four dogs,the biggest-----is called WangWang.A.that B about which C.of which D.which

C
具体什么理由也说不清楚