Explanation:

Let's break down all statements and options:

- K sits fifth to the left of J. K cannot be at any end.

- L is exactly in the middle (4th position).

- L sits third to the right of M.

- Only two boys sit between O and P.

- O is not the immediate neighbor of L.

Let’s try to arrange:

- Row: _ _ _ L _ _ _

- L is in the middle (4th).

- L is 3rd to the right of M: So, M must be in 1st position (as L is 4th, so 1,2,3,L).

- Row now: M _ _ L _ _ _

- K is 5th to the left of J. So there must be 4 people between K and J. Since K cannot be at end, and L is fixed, K can be 2nd and J will be 7th.

- Row: M K _ L _ _ J

- O and P: only two between, and O not next to L. Fits best as: M K P L _ O J (O not at either neighbor of L).

- N and O left; O already placed, so N is 5th. Final row: M K P L N O J

Now look at options:

1. NJ – N is 5th, J is 7th; difference = 2

2. PN – P is 3rd, N 5th; difference = 2

3. LO – L is 4th, O is 6th; difference = 2

4. KM – K is 2nd, M is 1st; difference = 1

All except option 4 have a difference of 2 places between the pair, while option 4 (KM) has difference 1. So, option 4 does not belong.

Option 4, KM is correct.