Explanation:

Let’s break down the statements step by step:

- There are 8 persons: M, O, P, Q, R, S, T, U; 4 floors (1 at the bottom to 4 at the top), 2 flats per floor (A - west, B - east).

- If persons are "immediately above/below" each other, they must be in the same flat type (both A or both B).

- “U lives south-west of M” = U is one floor below AND in flat A to M's flat B (since A is west of B).

- Q is two floors above M, same flat type.

- O lives immediately above S, same flat type, and S does not live anywhere below M’s floor.

- P doesn't live on a floor above M.

Let's try to assign:

- Suppose M is at floor x, flat B. So U should be at floor x-1, flat A. Q is at floor x+2, flat B as well.

- O is directly above S, same type. Since S can't be below M, S must be on floor x or higher.

- For P: not above M, so on M’s floor or below.

Now, check pairs:

1. U, T: U and T on same floor? No info links them.

2. Q, P: Q is two floors above M, P not above M. So, Q and P can't be same floor.

3. R, Q: No clear info places R or links to Q’s floor.

4. U, S: S cannot be below M (M > S or equal); U is one below M…so U and S cannot be together.

None of these options are directly supported. So the correct option is:

Option 5: None of the above

Key Explanation:

- The only facts about same floors are for O and S (not in options), and all linking statements prevent any listed pairs from sharing floors.

- We walk through all options and see only option 5 fits the given information.