The correct option is C ∠RQP=∠ONM
Given: ΔPQR∼ΔMNO
Two triangles are similar if
(i) their corresponding angles are equal and
(ii) their corresponding sides are in the same ratio (or proportion)
Here, P ↔ M, Q ↔ N and R ↔ O.
∴∠RQP=∠ONM
Hence, the correct answer is option (3).