What is the process of eutrophication and how do human activities accelerate it?

What is the process of eutrophication, and how do human activities accelerate it? It is when lakes contain an abundance of nutrients, or when organic matter builds up in water and it will begin to decay and decompose. It is accelerated when inorganic plant nutrients is in the runoff water.

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the answer is c, because they are being narrated.

3rd person, because the narrator is out of the story but explains the feeling of the main character