C knows the answer by deducing D is not yelling out the answer.os.tvboxnow.com' K! a$ m: p, l8 Y& [: J
That means D is not sure the answer by seeing one white and one black. V+ j- r" K0 b5 X+ i) L7 Bos.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.