PT 65 S4 Q6

The calm, shallow waters of coastal estuaries are easilypolluted by nutrient-rich ... ...

Which one of the following can be properly inferred from the information above?
(A) Fish in an estuary that has been polluted by sewage are generally more likely to die from pollution than are fish in an estuary that has been polluted in some other way.
(B) ...
(C) ...
(D) ...
(E) ...

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