Final answer:
Eutrophication is mainly caused by nitrogen and phosphorus from human sources like fertilizer and sewage, with plastic bottles being the least likely cause.
Explanation:
Eutrophication is caused by high concentrations of nitrogen (N) and phosphorus (P), mainly from human sources like fertilizer, sewage, and phosphorus-based detergent. While all the options mentioned can contribute to eutrophication, plastic bottles would be the LEAST LIKELY cause as they do not directly introduce excessive nutrients to water bodies.
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