C knows the answer by deducing D is not yelling out the answer. 0 Y I4 t1 V% m E4 @$ G5.39.217.77:8898That means D is not sure the answer by seeing one white and one black. 3 V! W3 J0 i9 b6 G+ l* OTVBNOW 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。C 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.