C knows the answer by deducing D is not yelling out the answer. ; ` d8 b7 q2 |8 Y4 [' A! IThat means D is not sure the answer by seeing one white and one black.tvb now,tvbnow,bttvb- y& E* r5 E' b% `1 D, o
C saw B is wearing the white, hence he is wearing the black
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C同B都答到
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.