Answer:
The answer may be (B)using ethanol in cars because it increases global warming which increases temperature which may also harm fish populations and for others options:(A)a burning coal cannot increase the temperature of the water because water cools down the temperature of any heated materials may taking some time to cool,(C)installing solar panels on home may have no relation with this question, and (D) generating electricity in a hydroelectric power plant has no effect on temperature and population of fish.
