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C knows the answer by deducing D is not yelling out the answer.
7 J7 X# j4 X% K( I' M& x" xTVBNOW 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./ g1 F. D2 T; ~3 H; _8 `& {; v, C1 a9 h
C saw B is wearing the white, hence he is wearing the black