please help am smol brain

Answer:
A
Step-by-step explanation:
In the proof, it says that MO is congruent to MO, <PMO is congruent to <NMO, and <POM is congruent to <NOM. We can locate these angles and side to find that these congruent angles surround the side. Therefore, the congruent relation is ASA (angle-side-angle) postulate
Answer:
a. ASA Postulate
Step-by-step explanation:
The proof is using an angle, a side, and an angle, in that order, to prove two triangles congruent, so the missing reason in ASA Postulate.
Answer: a. ASA Postulate