C knows the answer by deducing D is not yelling out the answer.tvb now,tvbnow,bttvb4 E9 T) P d0 c+ ?% C o4 g+ Y7 }3 _
That means D is not sure the answer by seeing one white and one black. w0 Y* G& G) z3 G6 I# W4 |1 `# \公仔箱論壇C saw B is wearing the white, hence he is wearing the black
C, because he saw B's hat is white and he knows D can see the color of B's and his hat. If B and his hat has the same color, D would speak out. But D kept silent, so C knows that his hat's color must be different.