DRDO Multi tasking staff Model paper 9

The linear arrangement is as follows:

By checking each option:
1) Q is sitting adjacent to M → False (as there is no surety with regard to position of M and O)
2) S is sitting adjacent to M → False (as there is no surety with regard to position of M and O)
3) N is sitting at second position from the left → True (as shown in the diagram)
4) P is sitting at extreme right end → False (as P is sitting at extreme left end)
Hence, statement 3 is correct one.