C knows the answer by deducing D is not yelling out the answer. 9 u0 b0 b: E9 \+ lTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。That means D is not sure the answer by seeing one white and one black. 7 j6 X9 \9 A& \4 r o# L3 o3 BC 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.