C knows the answer by deducing D is not yelling out the answer.
& t* f1 m* G: L$ G8 G5 f% c3 c& p5.39.217.77:8898That means D is not sure the answer by seeing one white and one black.tvb now,tvbnow,bttvb: v' a, |$ _1 \) U
C saw B is wearing the white, hence he is wearing the black |