PT 27 S4 Q6

Monarch butterflies spend the winter hibernating on trees in certain forests. ... ...

Which one of the following would it be most useful to know in evaluating the argument?
(A) the amount of forest land suitable for monarch butterfly hibernation that is not currently used by monarch butterflies for hibernation
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Weaker" Questions, Set 2 - "Evaluation" Subset