Which Statement About the Biological Dynamics of Forest Fragments Project

Which statement about the Biological Dynamics of Forest Fragments Project (BDFFP) is true?

A) It has shown that edge effects do not have a large impact on species diversity within fragments.
B) It is a controlled experiment that probably provides a conservative estimate of species losses.
C) It has shown that most of the forest fragments created by human activities are large enough to maintain most of their original species diversity.
D) It demonstrated that although conserving large areas of forest might be desirable from an ecological perspective, this approach is too expensive, so protecting a large number of small fragments is a more practical way to avoid large-scale extinctions.