The capital of Australia is (A) Canberra. Canberra is the purpose-built capital city of Australia, chosen for its central location between Sydney and Melbourne. It officially became the capital in 1927, succeeding Melbourne. Canberra houses the key government institutions, including the Parliament House and the official residence of the Prime Minister.

1. Habitat of the Yakut tribe in Northern Siberia.

2. The Yakuts, or Sakha, are a Turkic ethnic group that lives primarily in the Sakha Republic in the Russian Federation. Their habitat also extends to the Amur, Magadan, Sakhalin regions and the Taimyr and Evenk districts of the Krasnoyarsk Territory.

3. Yakut language belongs to the Siberian branch of Turkic languages. The Russian word Yakut is derived from Evenk Yoko.

4. In some old histories the Yakuts call themselves Sakha or Urangai Sakha.

5. The Yakuts engage in animal husbandry, traditionally focusing on the raising of horses.

The steppe grassland is primarily found in (A) Asia. The Eurasian Steppe, also known as the Great Steppe, is a vast expanse of grassland that stretches from Eastern Europe to Siberia in Asia. It is one of the world's largest temperate grasslands and spans several countries, including Russia, Ukraine, Kazakhstan, and Mongolia.

The world's highest waterfall is located in (B) Venezuela. The waterfall is named Angel Falls (Salto Ángel in Spanish), and it is situated in the Canaima National Park in the Gran Sabana region of Venezuela. Angel Falls is renowned for its impressive height, with a continuous drop of about 3,212 feet (979 meters) and a total height of 3,281 feet (1,000 meters).