Green roofs offer many environmental advantages, including the removal of some pollutants from rainwater. The parameters in the table above were measured in water samples collected after rainfall had passed through green roofs and over traditional roofs (N=5) in New York City. Mean levels of pH and pollutants in precipitation are shown in the table.Assume that the rainwater from one of the green roofs ran off directly into a nearby lake. Water quality results from which of the following parameters show that the green roof would likely improve water quality in the lake?

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