5. if p || q, which pair of angles must be congruent?
1 and 8
2 and 5
4 and 6
7 and 8

I think the correct answer from the choices listed above is the first option.  If p || q, the pair of angles that must be congruent would be angles 1 and 8. These angles are called alternate exterior angle.  The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles.

What are the choices