C knows the answer by deducing D is not yelling out the answer.tvb now,tvbnow,bttvb' O8 d* T7 s1 {- ] U' N* K
That means D is not sure the answer by seeing one white and one black.公仔箱論壇 c7 X6 ~4 D' I
C saw B is wearing the white, hence he is wearing the black |