Shortly after the power plant opened and began discharging its wastewater into the river, there was a decrease in the overall number of bass caught by anglers downstream from the plant.
Why were fewer bass caught after the power plant started discharging wastewater into the river?
The correct answer must fail to explain why fewer bass were caught downstream. Meanwhile, every wrong answer will state a difference between the periods before and after the power plant opened that implies bass were more scarce afterward, or that bass present were caught at a lower rate.
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