medium · LSAT Logical Reasoning
An environmental study of Lake P found that although the amount of toxic runoff entering the lake from local factories has decreased by 80% over the last decade, the concentration of heavy metals in the lake's fish has continued to rise.
Which of the following, if true, most helps to resolve the apparent discrepancy?
- Decades of earlier pollution left heavy metals buried in the lakebed, and recent disturbance of bottom-dwelling organisms is steadily releasing that stockpile back into the food chain.
- The local factories recently installed filtration systems that capture toxic waste with high efficiency.
- Comparable lakes in neighboring regions recovered fully once their nearby industrial sites shut down.
- The number of fishing permits issued for Lake P has been capped to prevent overfishing.
- Heavy metals are among the most persistent and toxic contaminants known to aquatic ecologists.
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