At a party, five girls O, P, M, N, R sit in one row. P is to the left of M and to the right of O; R is to the right of N but to the left of O. Who sits in the middle position?

Introduction / Context:
We are given two placement statements that together determine a unique left-to-right order, from which we select the central person.

Given Data / Assumptions:

• P is left of M and right of O ⇒ O < P < M.
• R is right of N but left of O ⇒ N < R < O.

Concept / Approach:
Combine to get a total order: N < R < O < P < M.

Step-by-Step Solution:
Write left→right: N, R, O, P, M.The middle (3rd) is O.

Verification / Alternative check:
Both constraints are satisfied in this lineup.

Why Other Options Are Wrong:
P and M are to the right of the middle; N and R are to the left.

Common Pitfalls:
Swapping the O–P order or placing R left of N.

Final Answer:
O