Explanation:

- Damon Galgut was awarded the Booker Prize 2021 for his novel The Promise.

- The Promise explores the decline of a South African family navigating the transition in the country.

- Option 1: The Promise - This is the correct answer. Damon Galgut won the Booker Prize 2021 for this book.

- Option 2: Great Circle is a novel by Maggie Shipstead and was shortlisted for the Booker Prize 2021.

- Option 3: A Passage North is written by Anuk Arudpragasam, also shortlisted for the Booker Prize that year.

- Option 4: The Fortune Men by Nadifa Mohamed was another shortlisted novel for the Booker Prize 2021.