Explanation:

Let’s break down the clues one by one:

- 8 people, 4 floors, 2 flats per floor: Flat 1 is west of Flat 2.

- B is above C with 2 floors between them, and they're in different flats.

- A lives west of D on an odd-numbered floor (so Flat 1 and D is in Flat 2).

- F is immediately above C.

- G is on the 4th floor and no one is west of G (so G is in Flat 1, Floor 4).

- H isn’t on the 1st floor.

- The question is: Who’s just below H?

Here’s what these details mean:

- Because G is in Flat 1, Floor 4 (top, westmost), the only person above G is nobody (since there is no 5th floor).

- B and C are separated by two floors, and F is immediately above C.

- A and D are on an odd floor: Floor 1 or 3; A is Flat 1 (west), D is Flat 2 (east) of that floor.

Mapping this out step by step, H can’t be on the first floor but fits possibly on the second, third, or fourth, but 4th is already occupied by G in Flat 1. Test H in Flat 2, Floor 4: If so, D can fit elsewhere.

Ultimately, mapping possibilities (you can check it for yourself—mapping people out according to these clues), H comes to the 3rd floor, Flat 2. So, the person “just below H” is on 2nd floor, Flat 2.

Piecing together everything, D fits there.

- Option 4 - D -

Correct answer: Option 4, D.

Let me know if you want an explicit floor-by-floor arrangement!