C knows the answer by deducing D is not yelling out the answer.
3 |! l p& S7 V0 d6 o+ |. F) m" x5.39.217.76That means D is not sure the answer by seeing one white and one black.
! ^, y' h. o9 `" T) g/ o, c公仔箱論壇C saw B is wearing the white, hence he is wearing the black |