C knows the answer by deducing D is not yelling out the answer.tvb now,tvbnow,bttvb8 {2 |! N, N1 D- ?& B8 }9 h
That means D is not sure the answer by seeing one white and one black.
2 _5 n. k( m4 x% ]3 ]; V$ E2 i2 m公仔箱論壇C saw B is wearing the white, hence he is wearing the black |