C knows the answer by deducing D is not yelling out the answer.
& N9 c) m* L. a6 A) z( DThat means D is not sure the answer by seeing one white and one black.tvb now,tvbnow,bttvb2 \7 n- E3 {1 ^8 s% S' w
C saw B is wearing the white, hence he is wearing the black |