Passage A, but not passage B, asserts which one of the following regarding ... ...

Passage A, but not passage B, asserts which one of the following regarding ecologists who study introduced species?
(A) Their research has been limited to studying the economic impact of introduced species.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT 67): Reading Comprehension