C knows the answer by deducing D is not yelling out the answer.www.tvboxnow.com0 k0 z& I) Q: ~
That means D is not sure the answer by seeing one white and one black. - [4 N. z/ P+ [- T! G l# H( ~) b, xC 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.