Explanation:

- Eight people live in a building with 4 floors and 2 flats (Flat 1 to the west and Flat 2 to the east).

- B lives above C with two floors between them and they are in different flats.

- F lives immediately above C.

- A lives to the west of D on an odd-numbered floor.

- G lives on the fourth floor and is the westernmost resident.

- H does not live on the first floor.

Let's break down the possible placements:

- C must be on the first floor since F is immediately above, putting C in Flat 2.

- F is therefore on the second floor in Flat 2.

- B, two floors above C and in a different flat, must be on the fourth floor in Flat 1.

Thus, B is on Floor 4, in Flat 1.

Correct Answer: Option 4: Fourth