Answer: A) segment MN ≡ segment QP
If two triangles are congruent, they have corresponding sides and corresponding angles congruent.
In order to find which are the corresponding sides, you need to be careful about the order of the letters, and therefore of the vertices (see picture attached).
From the congruency, we can say:
∠M ≡ ∠P
∠N ≡ ∠Q (statement B)
∠O ≡ ∠R (statement D)
MN ≡ PQ
NO ≡ QR (statement C)
OM ≡ RP
Hence, the only statement which is not true is A) segment MN ≡ segment QP.
