Answer: ASA Congruence Postulate
Explanation: Angle-Side-Angle congruence postulate is saying that if two triangle is congruent in angle, side, angle that means the triangle is congruent.
In this question, the QNP and MNR angle should be congruent since they are made from 2 same lines. Knowing this, if you combine it with the other data, you will get 2 congruent angle and 1 congruent side.