The Australian Landmass Is Described as One of the Oldest

The Australian landmass is described as one of the oldest, geologically, because

A) it was one of the first continents to separate from Gondwana.
B) significant alteration of the landscape by non-indigenous Australians has occurred only in the last few centuries.
C) the Australian plate (the lithosphere that carries the Australian continent) was the first of the earth's plates to form.
D) the land was largely empty and subjected to the weather.
E) it has experienced relatively little mountain-building or volcanic activity.