In what kind of areas do researchers find high caffeine levels？A．Areas near wastewater tre

In what kind of areas do researchers find high caffeine levels？

A．Areas near wastewater treatment plant.

B．Areas that are densely populated.

C．Areas where rivers enter the ocean.

D．Areas far from large population center.

请帮忙给出正确答案和分析，谢谢！

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