Explanation:

- Option 1: subsided

- "Subsided" means to become less intense or to sink to a lower level.

- It's less likely to bury people alive instantly.

- Option 2: damaged

- "Damaged" implies harm or impairment was caused.

- Alone, this term doesn't indicate a collapse or situation that would bury people.

- Option 3: collapsed

- "Collapsed" indicates a sudden fall or cave-in.

- This is the most appropriate word for describing a building falling down and burying people.

- Option 4: shook

- "Shook" means to tremble or cause to vibrate.

- This action doesn't necessarily lead to being buried alive.