medium · GMAT Verbal
After the city of Dovetail removed an invasive reed from 17 hectares of wetland, native plant cover initially increased by 16 percentage points. Two years later, however, that recovery had plateaued. Soil compaction and altered water flow—conditions the reed-removal program did not address—continued to prevent seedlings from establishing in much of the site. Reed removal was therefore necessary for recovery, but the evidence indicates that it was not sufficient by itself.
Which new situation most closely follows the principle supported by the passage?
- A project doubles its reed-removal budget while refusing to investigate water flow.
- A mine-restoration project removes contaminated soil and then also repairs drainage and soil structure before reseeding native plants.
- A project removes contaminated soil and assumes vegetation will recover without assessing any remaining site conditions.
- A city leaves the invasive reed in place because removal alone is not sufficient.
- A restoration team measures only the acreage treated and not whether native plants establish.
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