Explanation:

- The International Booker Prize was established in 2005. It is an award for the best book translated into English and published in the UK or Ireland.

- Option 3: 2005 - This is the correct year when the International Booker Prize was first launched.

- Option 1: 1918 - This year is not related to either the International Booker Prize or the original Booker Prize.

- Option 2: 1969 - This is the year the original Booker Prize, now known as the Booker Prize for Fiction, was established.

- Option 4: 1981 - This year is not associated with the establishment of either prize.