Assume That Earth's Tectonic Plates Have Always Been in the Position

Assume that Earth's tectonic plates have always been in the position they are today.What likely would have happened to marsupials under these conditions?

A) Marsupials would have continued to diversify in Laurasia resulting in more marsupial species than are present today.
B) Marsupials would have decreased in the number of species with only the most fit able to survive and reproduce.
C) Marsupial mammals would have adapted to the changing northern climate along with placental mammals.
D) Marsupials would be found only in the Arctic and other northernmost continents and land masses today.
E) Marsupials would have gone extinct as they would not have been able to migrate into South America and Australia.