The correct answer is - C. the Western Plateau.
The Western Plateau is the largest geographic unit in Australia, and it covers about 2/3 of the continent. It is also referred to as the Australian Shield, and it is composed of very old rocks from the long gone continent of Gondwana.
It is a very arid place, the rainfall is at the same amount as in the Sahara Desert, and there no constantly flowing rivers or streams. It is here where we have vast deserts, the Australian outback, and on the edge of it, along the coastal line, there are farmlands as well. Big portion of this part of Australia is still unexplored.
