a gre verbal section passage (confusing) Could anyone help me out? I need a analysis for the passage below: Recently an unusually high number of dolphins have been found dead of infectious diseases, and most of these had abnormally high tissue concentrations of certain compounds that, even inlow concentrations, reduce dolphins’ resistance to infection. The only source of these compounds in the dolphins’ environment is boat paint. Therefore, since dolphins rid their bodies of the compounds rapidly once exposure ceases, their mortality rate should decline rapidly if such boat paints are banned. Question: Which of the following, if true, most strengthens the argument? C The compounds break down into harmless substances after a few months of exposure to water or air. The answer is C, but how exactly could C STRENGTHEN the author's argument? I think it's just a presumption, considering the author said "dolphins rid their bodies of the compounds rapidly once exposure ceases". B would be a much better answer for me though.