C knows the answer by deducing D is not yelling out the answer.tvb now,tvbnow,bttvb; B& H( C1 }! M( J) g% c
That means D is not sure the answer by seeing one white and one black.
7 \; D/ I. { @& d7 @9 S- r) bC saw B is wearing the white, hence he is wearing the black |