Biologists found that off the northeast coast of a certain country the ... ...

Biologists found that off the northeast coast of a certain country the P-plankton population has recently dropped 10 percent. Additionally, fish species X, Y, and Z are beginning to show extraordinarily high death rates in the region. Since these species of fish are known to sometimes eat P-plankton, biologists believe the two phenomena are connected, but the exact nature of the connection is unknown. No other species in the ecosystem appear to be affected. Which one of the following, if true, most helps to explain the biologists’ findings?
(A) Several major pharmaceutical companies in the region have been secretly dumping large amounts of waste into the ocean for many years.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT67): Logical Reasoning B

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