Darling Downs is a

The Darling Downs is a pastoral and agricultural region located on the western slopes of the Great Dividing Range in southern Queensland, Australia. It is characterized as a fertile grassland and plateau region.

• The area is renowned for its rich black volcanic soils, making it one of Australia's most productive farming zones for crops like wheat and barley, as well as livestock grazing.
• Other major global grasslands include the Pampas in South America, the Prairies in North America (including Canada), the Steppes in Eurasia, and the Veld in South Africa.

Therefore, option A is correct as it accurately identifies the geographical nature and location of the Darling Downs.