C knows the answer by deducing D is not yelling out the answer.5.39.217.76$ e) y) ]* }8 j+ g8 ]6 m
That means D is not sure the answer by seeing one white and one black.tvb now,tvbnow,bttvb- P& @6 ?* i, @; \4 P$ y+ k! ]
C saw B is wearing the white, hence he is wearing the black |