PT 64 S3 Q6

Local resident: An overabundance of algae must beharmful to the smaller ... ...

The local resident’s argument is most vulnerable to criticism on the grounds that it
(A) presumes, without providing justification, that smaller fish are somehow more susceptible to harm as a result of overabundant algae than are larger fish
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2011 LSAT (PT 64): Logical Reasoning B