C knows the answer by deducing D is not yelling out the answer.tvb now,tvbnow,bttvb5 Q. H. X! |9 }' Q7 a+ e" W: K' x
That means D is not sure the answer by seeing one white and one black.
& ~ X( p* r8 @1 r$ a5 b- f4 ^2 G# Y: a% rtvb now,tvbnow,bttvbC saw B is wearing the white, hence he is wearing the black |