Which one of the following is the largest island in the world?

The correct answer is Option (4) → Greenland

Greenland, in the North Atlantic between the Arctic and Atlantic Oceans, is the largest island in the world, with an area of about 21.7 lakh km², most of it under a thick ice sheet. It is a self-governing territory of Denmark. Australia is larger, but it is counted as a continent, not an island.