Which of the following can be inferred from the passage about the "recent studies"? A. They point to the need for a significantly revised perspective on oceanic island bats generally. B. They were undertaken with the assumption that Philippine fruit bats were somewhat atypical among oceanic bats. C. They remain somewhat controversial among researchers because of the number of standard hypotheses that they tested. D. They have largely confirmed what scientists thought about the Philippine fruit bat. E. They suggest that bats on oceanic islands are more vulnerable to extinction than previously thought.