This question is in anticipation of Earth Day, April 22. Does that give you a hint towards the correct answer? By depositing cut grass back onto the soil, homeowners are (2) recycling nutrients. This cut grass will decay, and nutrients from these cut pieces will find their way back to the soil. Recycling! By bagging those clippings and throwing them away, we'd waste nutrients that could be reused again.
This process does not (1) increase the diversity of life, does not control (3) pathogens or pests, and does not (4) produce any new species. By process of elimination, the correct answer is 2.
*Question taken from nyslivingenvironment.net, from August 2008 Regents
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