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The key is that the passage gives evidence that: the spruce budworm explanation is incomplete or wrong.
Let's map it carefully.
Facts
  1. Tennessee warblers depend on South American tree cover.
  2. That tree cover is disappearing.
  3. Tennessee warbler populations are declining.
  4. Some people attribute the decline to a temporary drop in spruce budworms.
  5. Baltimore orioles are also declining.
  6. Baltimore orioles do not eat budworms.
  7. Orioles also depend on the same disappearing South American tree cover.

What does the oriole evidence suggest?

Since orioles don't eat budworms, their decline cannot be explained by budworm shortages.

So a more likely common cause of both declines is: Loss of South American tree cover

Now connect to B

If the real problem is disappearing tree cover, then:
  • Budworms may eventually return to normal.
  • But the tree cover may still be gone.

Therefore: Even when budworms recover, Tennessee warblers may continue to struggle.

Which supports:
(B) The Tennessee warbler population will not rebound when the spruce budworm population returns to normal.
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