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C knows the answer by deducing D is not yelling out the answer.2 G) v0 M: O; `6 T/ l, u
That means D is not sure the answer by seeing one white and one black.5.39.217.77:88982 u: w3 h( L/ X: ^; R6 q8 J
C saw B is wearing the white, hence he is wearing the black