The answer is either C or D. I’m not sure but i’m closer to D. Hope this helped!
<span>Australia is so large that its climate varies. The greater part of the continent is desert or semi-arid. Only the south-east and south-west corners have a temperate climate and moderately fertile soil. The northern part has a tropical climate, varied between tropical rainforests, grasslands, and part desert.</span>
Ridge push is a process in which the unlifted ridge is thought to push the oceanic plate towards the subduction zone. Slab pull is a process where by the weight of a subducting plate help to pull the trailing lithosphere into subduction zone. Ridge lush is cause by the potential energy gradient from the high topography. Slab pull is caused by negative buoyancy of the subducting plate.