releasing warm water into the stream driving cars through the stream reducing use of fertilizers near the stream increasing use of chemicals near the stream
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which human activity would have the greatest positive impact on the water quality of a stream?
Possibilities:
- releasing warm water into the stream
- driving cars through the stream
- reducing use of fertilizers near the stream
- increasing use of chemicals near the stream

reducing use of fertilizers near the stream