C knows the answer by deducing D is not yelling out the answer.公仔箱論壇7 D$ a( ]7 Y5 o, l F" P
That means D is not sure the answer by seeing one white and one black.
0 @4 X7 H+ [" r: ?tvb now,tvbnow,bttvbC saw B is wearing the white, hence he is wearing the black |