What is the missing step in the proof?
a. statement: ∠ikl≅∠jlk
reason: for parallel lines cut by a transversal, corresponding angles are congruent.

b. statement: ∠ikl and ∠ikc are supplementary.
reason: linear pair theorem

c. statement: ∠gji≅∠jlk
reason: for parallel lines cut by a transversal, corresponding angles are congruent.

d. statement: ∠gji and ∠ijl are supplementary.
reason: linear pair theorem

1. ∠eij≅∠gji given
2. ∠eij≅∠ikl for parallel lines cut by a transversal, corresponding angles are congruent.
3. ∠ikl≅∠gji transitive property of equality
4.
5. ∠ikl and ∠ijl are supplementary. transitive property of equality