C knows the answer by deducing D is not yelling out the answer.0 |5 \( z* F( l9 N: }! \4 v5 x6 Q
That means D is not sure the answer by seeing one white and one black. ; `' ^" l" \; u, _: W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.