The correct answer is option3i.e.Australia. Seven major continents are -
Asia is the largest continent . It covers about one-third of the total land area of the earth. The continent lies in the Eastern Hemisphere. Asia is separated from Europe by the Ural mountains on the west. The combined landmass of Europe and Asia is called Eurasia (Europe + Asia).
Europe is much smaller than that of Asia. The Arctic Circle passes through it.
Africa is the second-largest continent after Asia. The Equator or 0° latitude runs almost through the middle of the continent. It is the only continent through which the Tropic of Cancer, the Equator and the Tropic of Capricorn pass. The world's longest river the Nile flows through Africa.
North America is the third largest continent in the world. It is linked to South America by a very narrow strip of land called the Isthmus of Panama.
South America lies mostly in the Southern Hemisphere. The Andes, world's longest mountain range, runs through its length from north to south. South America has the world's largest river, the Amazon.
Australia is the smallest continent that lies entirely in the Southern Hemisphere. It is surrounded on all sides by the oceans and seas. It is called an island continent. Hence option 3 is correct.
Antarctica is completely in the Southern Hemisphere and is a huge continent. The South Pole lies almost at the centre of this continent. As it is located in the South Polar Region, it is permanently covered with thick ice sheets.