C knows the answer by deducing D is not yelling out the answer.
7 _) n/ V% B, h* HTVBNOW 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。That means D is not sure the answer by seeing one white and one black.tvb now,tvbnow,bttvb5 S8 J6 n& q1 W7 f, _8 C- A
C saw B is wearing the white, hence he is wearing the black |