Explanation:

- We know Q sits second from one of the extreme ends.

- M is sitting to the left of S, with two people in between them. Hence, S is seven seats away from M.

- There's one person between Q and M.

- L sits exactly between Q and S.

- O is third to the left of R.

- There is one person between S and O.

- N is fourth to the right of R and P is second left to N.

- R is not next to S.

To solve, arrange these conditions:

- Consider two possible scenarios where Q is either second from the left or right. That will help satisfy initial conditions incrementally.

- Assign other persons based on the relational positions given. This will eventually position N at one extreme end.

Option 4: N is at the extreme right end.

The correct answer is:

Option 4: N

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