The correct option based on the paralel line given is that the corresponding angles are congruent.
Given that a student was told to consider the diagram and asked to prove that angle 1 ≅ angle 2.
We are to find the reason for the second step in the following proof. Since lines A and B are parallel and cut by a transversal, so angles 1 and 3 are corresponding angles. That is, ∠1. ≅ ∠3
Also, angles 2 and 3 are vertically opposite angles, so ∠2 ≅ ∠3.
And, therefore we get ∠1 ≅ ∠2.
Thus, the reason in the second step will be angles 1 and 3 are corresponding angles and corresponding angles are congruent.
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