Many studies have found a positive association between levels of dissolved organic carbon and mercury in bodies of fresh water undisturbed by human activity. But Enelton Fagnani, José Roberto Guimarã, and Pedro Sérgio Fadini did not find this correlation in an examination of freshwater bodies disturbed by industrial activity, leading some scientists to hypothesize that the association could be particular to undisturbed waters. However, Jeffrey D. Jeremiason and colleagues carried out a study on freshwater bodies disturbed by mining that showed similar results to the studies on undisturbed waters, suggesting that __________
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hardWhich choice most logically completes the text?
A
disturbances linked to industrial activity affect significantly more bodies of fresh water than disturbances linked to mining do.
B
the effects of industrial activity on the association between levels of dissolved organic carbon and mercury should not be taken as indicative of the effects of every type of human disturbance.
C
levels of dissolved organic carbon and mercury are both much higher in bodies of fresh water disturbed by industrial activity than they are in bodies of fresh water disturbed by mining.
D
Fagnani, Guimarã, and Fadini’s study used different methods to measure the concentration of mercury in fresh water than Jeremiason and colleagues’ study did.