The option that is a missing step of the proof of ∠D = ∠F is option C (Imaged attached) which is C, ∠DEO ≅ ∠FEO.
In any triangle, the angle bisector of an angle is known to be that straight line that shares the angle into two said equal or congruent angles.
Note that ∠D = ∠F
The bisector EO is said to bisects the angle ∠DEF and an interior angle of ΔDEF.
So this implies that the angle is divided into 2 equal angles and the option that fit into this is ∠DEO ≅ ∠FEO
So, The option that is a missing step of the proof of ∠D = ∠F is option C (Imaged attached) which is C, ∠DEO ≅ ∠FEO.
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