Within the Country of Indonesia,the Island of Sumatra Has Tigers

Within the country of Indonesia,the island of Sumatra has tigers and rhinos,while to the East,the island of Sulawesi has cockatoos and tree kangaroos.What is the best explanation for this observation?

A) The climates on the two islands are very different,allowing some species to survive,and others not.
B) Some species can migrate between islands and others cannot.
C) Animals in Sumatra evolved independently,while those in Sulawesi came from Australia.
D) Animals in Sumatra came from Asia,while those in Sulawesi came from Australia.
E) Animals in Sumatra and Sulawesi both came from Asia,but those in Sulawesi migrated farther.