Explanation

The key clue is that birds repeatedly return to the same small area, and even a 2.02-hectare fragment proves important. That supports the idea that small, specific habitats matter and should be preserved.

So the sentence is saying this behavior provides justification for conserving those kinds of habitats.

Blank (i): “a rationale for” fits because the behavior supports or justifies conservation.

Blank (ii): “circumscribed habitats” fits because the example emphasizes small, limited areas.

Answer: B and E