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C knows the answer by deducing D is not yelling out the answer.
% l( v2 @6 S8 x3 aTVBNOW 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.公仔箱論壇6 L5 B6 U; s4 r
C saw B is wearing the white, hence he is wearing the black