waha1ha1

C knows the answer by deducing D is not yelling out the answer.
/ n3 B2 V  M" ~' a. n5 n0 _tvb now,tvbnow,bttvbThat means D is not sure the answer by seeing one white and one black.5.39.217.76( U/ D: y! x3 z
C saw B is wearing the white, hence he is wearing the black