PT 65 S1 Q19

Last winter was mild enough to allow most bird species to forage naturally, ... ...

Which one of the following, if true, would most strengthen the reasoning in the argument?
(A) Increases in bird populations sometimes occur following unusual weather patterns.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Dec 2011 LSAT (PT 65): Logical Reasoning A