Eight people are sitting in two parallel rows with 4 people each in such a way that there is equal distance between adjacent persons and they are facing each other.

In row I – L, M, N and O are seated and all of them are facing south.

In row II – P, Q, R and S are seated and all of them are facing north.

N sits next to the person at the extreme right end of their row and is facing R. S sits at the extreme left end of their row. Q sits to the immediate right of R and is facing L. O sits at the extreme left end of their row.

Who sits at the extreme right end of the row of people facing South?

Given : 

1. Eight people are sitting in two parallel rows with 4 people each in such a way that there is equal distance between adjacent persons and they are facing each other.
2. In row I – L, M, N and O are seated and all of them are facing south.
3. In row II – P, Q, R and S are seated and all of them are facing north.

Explanation :

1) N sits next to the person at the extreme right end of their row and is facing R.

2) S sits at the extreme left end of their row.

3) Q sits to the immediate right of R and is facing L.

4) O sits at the extreme left end of their row.

After positioning Q, R, L and O two positions i.e one position in each row is vacant which will be occupied by the only people left in their respective rows i.e M in row - I and P is row - II.

Thus, after the final arrangement M sits at the extreme right end of the row of people facing South i.e in row - I.

Hence, "M" is the correct answer.