C knows the answer by deducing D is not yelling out the answer. ( h, F4 K8 h; I4 @% I公仔箱論壇That means D is not sure the answer by seeing one white and one black. 9 x6 M3 ?7 o. q& B: {* |( Gtvboxnow.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.