Question

how could a large farm near a river impact the rivers water quality?
it could improve water quality by filtering pollutants.
it could make the water flow faster causing corrosion.
it could introduce new pollutants into the river.
it could purify the river water through natural processes.

Explanation:

Large farms often use fertilizers and pesticides. These can runoff into the river during rain, introducing pollutants. Also, livestock waste from farms can contaminate the river.

Answer:

It could introduce new pollutants into the river.