How Does Continental Drift Explain the Uniqueness of Australian Fauna

Multiple Choice

How does continental drift explain the uniqueness of Australian fauna?

A) Marsupials fill the ecological niche as eutherians on other continents.
B) Fossil evidence suggests that marsupials originated in Asia and reached Australia via South America.
C) The subsequent separation of the southern continents formed an island of marsupials.
D) In Australia, marsupials diversified, and eutherians became extinct.