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C knows the answer by deducing D is not yelling out the answer.os.tvboxnow.com$ [2 d& A* B; ~* H6 }0 A0 z
That means D is not sure the answer by seeing one white and one black.
* n( k( T3 ^; MTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。C saw B is wearing the white, hence he is wearing the black