PT 55 S2 Q13

The following passages concern a plant called purpleloosestrife. Passage ... ...

Which one of the following, if true, would cast doubt on the argument in passage B but bolster the argument in passage A?
(A) Localized population reduction is often a precursor to widespread endangerment of a species.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Comparative Reading