Forester: The great majority of the forests remaining in the world are only sickly fragments of the fully functioning ecosystems they once were. These fragmented forest ecosystems have typically lost their ability to sustain themselves in the long term, yet they include the last refuges for some of the world's most endangered species. To maintain its full complement of plant and animal species, a fragmented forest requires regular interventions by resource managers.

Question: The forester's statements, if true, most strongly support which one of the following?
Options:
A. Most of the world's forests will lose at least some of their plant or animal species if no one intervenes.
B. Unless resource managers regularly intervene in most of the world's remaining forests, many of the world's most endangered species will not survive.
C. A fragmented forest ecosystem cannot sustain itself in the long term if it loses any of its plant or animal species.
D. A complete, fully functioning forest ecosystem can always maintain its full complement of plant and animal species even without interventions by resource managers.
E. At present, resource managers intervene regularly in only some of the world's fragmented forest ecosystems.
Answer: "A"