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The passage presents a problem (kelp decline from warming and urchin increases) and two interventions: seeding juvenile kelp and culling urchins. It contrasts outcomes: thicker canopies where both actions occurred vs. rapid grazing where only seeding was tried. That comparative evidence supports B: a combined strategy is more effective than seeding alone. Option A contradicts the observation that seeded-only sites were eaten down. Option C is unsupported; the text does not claim ecological harm from culls—only improved results when culls accompany seeding. Option D overgeneralizes; the monitoring data show success in combined-treatment areas. On Nelson–Denny main-idea questions, look for A/B comparisons tied to outcomes; the author’s recommendation typically aligns with the condition producing the best results. The structural cue “while” signals contrast, helping pinpoint the performance difference that the correct choice summarizes succinctly without adding claims not in the paragraph.