C knows the answer by deducing D is not yelling out the answer.
$ S8 l& X- _4 C, ~5 L2 ^TVBNOW 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,bttvb* l9 m3 C; i% c6 d
C saw B is wearing the white, hence he is wearing the black |