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Question 33·200 Super-Hard SAT Reading Questions·Craft and Structure

Entomologist Nia Patel has proposed that evaluations of urban bee corridors report both adult bee abundance and nest survival. Some project managers object that monitoring nests is unnecessary because a corridor attracting many adult bees is already functioning as high-quality habitat. Flowering strips can draw foraging adults from surrounding areas, however, while pesticide residues in the strips' nesting soil kill developing larvae, allowing adult counts to remain high even as nests repeatedly fail. Patel argues that this possibility makes the second measure an essential check on the first.

Which choice best describes the function of the underlined sentence in the text as a whole?