Final answer:
Set 2) mn ≅ pq, m ≅ p, and no ≅ qr is the correct set of relationships to prove that two triangles are congruent according to the SAS theorem, as it provides two sides and the included angle between them for each triangle.
Step-by-step explanation:
The SAS (Side-Angle-Side) theorem states that two triangles are congruent if two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle. Given the relationships amongst line segments and angles mentioned: 1) mo ≅ pr, mn ≅ pq, and no ≅ qr; 2) mn ≅ pq, m ≅ p, and no ≅ qr; 3) mn ≅ pq, n ≅ r, and no ≅ qr; 4) mn ≅ pq, n ≅ q, and no ≅ qr; the correct set of relationships to prove two triangles are congruent using the SAS theorem is the set that provides two sides and the angle between them.
After examining the relationships, the only set that fits the criteria of the SAS theorem is set 2) mn ≅ pq, m ≅ p, and no ≅ qr. This set shows that two sides (mn and no) and the included angle (angle m or p) of one triangle are equal to the corresponding two sides (pq and qr) and the included angle (angle p) of another triangle, proving congruence between the two triangles under the SAS theorem.