Which of the following continents has the lowest population?

The correct answer is Option (1) → Australia

Australia has the smallest population of the inhabited continents, only about 2.7 crore people, while Europe, North America and South America each have between about 43 and 75 crore. Most of Australia is dry desert, so its people live mainly along the eastern and south-eastern coasts. (Antarctica, which has no permanent population at all, is not among the options.)