C knows the answer by deducing D is not yelling out the answer.& Z- W6 M$ p2 g& z+ f' |6 z/ B" _
That means D is not sure the answer by seeing one white and one black. " @$ a$ P! C' i5 o. J' S! Lwww.tvboxnow.comC saw B is wearing the white, hence he is wearing the black
C, because he saw B's hat is white and he knows D can see the color of B's and his hat. If B and his hat has the same color, D would speak out. But D kept silent, so C knows that his hat's color must be different.