Which of the following is correctly matched?

All of the above.

The correct answer is Option (4) - All of the above.

• Steppes are vast grassland plains, and they are commonly associated with Russia.
• Prairies are also extensive grasslands, and they are typically associated with North America.
• Velds refer to the grasslands found in South Africa.

Plains are found in all continents except Antarctica. Some are tree-covered and others are grassy. Grasslands have different names in different climates and countries. E.g. steppes, prairies, pampas, veld etc.