Mount McClintock is the highest mountain (3,490 m / 11,456 ft) in the Britannia Range in Australian Antarctic Territory, surmounting the south end of Forbes Ridge, 10 kilometers (6.2 mi) east of Mount Olympus. It is also higher than all other peaks of Australia, including all external territories. It was discovered by the Discovery expedition (1901-04) and named for Admiral Sir Leopold McClintock, Royal Navy, a member of the Ship Committee for the expedition.

Sydney is the state capital of New South Wales and the most populous city in Australia and Oceania. Located on Australia's east coast, the metropolis surrounds the world's largest natural harbour and sprawls about 70 km (43.5 mi) on its periphery towards the Blue Mountains to the west, Hawkesbury to the north and Macarthur to the south. Sydney is made up of 658 suburbs, 40 local government areas and 15 contiguous regions. Residents of the city are known as "Sydneysiders". As at June 2016 Sydney's estimated population was 5,029,768.

The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the Coral Sea, off the coast of Queensland, Australia.

Answer: C) Canberra

Explanation: Canberra is the capital city of Australia, located in the Australian Capital Territory (ACT). It was chosen as the capital of Australia in 1908 due to its location between Melbourne and Sydney, which were the two largest cities in Australia at the time. The city is home to many important institutions, including the Australian Parliament and several major national museums and galleries.

The population of Australia is around 25 million.

Canberra is the capital city of Australia. With a population of 381,488, it is Australia's largest inland city and the eighth-largest city overall. The city is located at the northern end of the Australian Capital Territory (ACT), 280 km (170 mi) south-west of Sydney, and 660 km (410 mi) north-east of Melbourne. A resident of Canberra is known as a "Canberran". Although Canberra is the capital and seat of government, many federal government ministries have secondary seats in Sydney, as does the Governor-General and the Prime Minister.

Answer: B) Uluru

Explanation: Uluru, also known as Ayers Rock, is a large sandstone rock formation in Uluru-Kata Tjuta National Park, located in the Northern Territory of Australia. It is a sacred site for the indigenous Anangu people and is recognized as a UNESCO World Heritage site. The Great Barrier Reef, on the other hand, is a vast coral reef system off the coast of Australia, while Kakadu National Park is a protected area in the Northern Territory known for its diverse wildlife and cultural significance.

Australia officially 'The Commonwealth of Australia', is a country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It is the largest country in Oceania and the world's sixth-largest country by total area. The neighbouring countries are Papua New Guinea, Indonesia and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east. Australia's capital is Canberra, and its largest urban area is Sydney.

Australia is the largest island and the smallest continent in the world. It is two times larger than India.

Answer: B) Australian Capital Territory

Explanation: The Australian Capital Territory (ACT) is the smallest state or territory in Australia by area, covering just over 2,400 square kilometers. It is home to the national capital of Canberra, as well as a number of important national institutions, including Parliament House, the High Court of Australia, and the Australian War Memorial. Tasmania, Victoria, and the Northern Territory are all larger than the ACT in terms of area.