Question ID:PT85 S3 Q23 Passage:Researchers have found that some unprotected areas outside of a national park that was designed to protect birds have substantially higher numbers of certain bird species than comparable areas inside the park. Stem:Which one of the following, if true, most helps to explain the researchers' finding? Correct Answer Choice:AChoice A:Moose are much more prevalent inside the park, where hunting is prohibited, than outside the park, and moose eat much of the food that the birds need to survive. Choice B:The researchers also found that some unprotected areas outside of the park have substantially higher numbers of certain reptile species than comparable areas inside the park. Choice C:Researchers tagged a large number of birds inside the park; three months later some of these birds were recaptured outside the park. Choice D:Both inside the park and just outside of it, there are riverside areas containing willows and other waterside growth that the bird species thrive on. Choice E:The park was designed to protect endangered bird species, but some of the bird species that are present in higher numbers in the unprotected areas are also endangered.