Until a Few Years Ago, Ivory-Billed Woodpeckers Had Not Been

Until a few years ago, ivory-billed woodpeckers had not been seen since the 1940s.The species was widely assumed to be extinct.Its habitat in the lowland forests of the southeastern United States had been destroyed by clear cutting.Then, in 2004, two ornithologists thought they spotted an ivory-bill in an Arkansas swamp.These and other ornithologists immediately began a massive search.Several more sightings and a few audio recordings were made, and ornithologists hoped the species was recovering now that forests are regrowing.But skeptics challenged both the sightings and the recordings.No reliable sightings have been made since 2005.Given this information, what conclusion can be drawn about the extinction of the ivory-billed woodpecker?

A) It is probably extinct, since no sightings have been made since 2005.
B) It is probably extinct, since the few sightings were likely of the last survivors.
C) It is not extinct, since it was recently seen and heard by competent ornithologists.
D) Its extinction is not certain, because its swamp forest habitat makes it difficult to track.
E) It will be considered extinct if recent photos and videos cannot be verified by experts.