waha1ha1

C knows the answer by deducing D is not yelling out the answer.
5 `* O) w( G! ]8 y0 ptvb now,tvbnow,bttvbThat means D is not sure the answer by seeing one white and one black.
; m: A5 ~+ j0 t, b' {: d5 r公仔箱論壇C saw B is wearing the white, hence he is wearing the black