PSAT Reading & Writing Quiz
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Researchers tracked two groups of houseplants for eight weeks. Group A received fertilizer every week and was watered whenever the top soil felt dry; Group B received no fertilizer but was watered on the same schedule. By week eight, Group A had grown an average of 4 cm more than Group B, but Group A also happened to be placed closer to a window after week two when the lab rearranged shelves. In a follow-up week, both groups were placed equally far from the window, and the growth difference narrowed. The most reasonable inference is that _______.
Which choice most logically completes the text?
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