C knows the answer by deducing D is not yelling out the answer.
' o& f9 J j. R/ I* `9 G, @公仔箱論壇That means D is not sure the answer by seeing one white and one black.
( F7 n# T1 d9 u$ ?. l4 Ntvb now,tvbnow,bttvbC saw B is wearing the white, hence he is wearing the black |