We are given, ∠AFD =90° AND ∠AFB=31°
∠AFD=∠AFB+∠BFC+∠CFD
FROM FIGURE, ∠AFB=∠CFD
90°=∠AFB+∠BFC+∠AFB
90=31+∠BFC+31
90=62+∠BFC
∠BFC=90-62=28°
∠BFC=∠DFE (AS GIVEN IN FIGURE)
SO ∠BFC=28° (OPTION D)
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