The correct answer is D. All of the above.
Agricultural runoff, industrial effluents, and untreated sewage are all types of pollution that can have a significant impact on fish health.
Agricultural runoff is the water that flows off of farms and into nearby waterways. It can contain pesticides, fertilizers, and other chemicals that can harm fish and other aquatic life.
Industrial effluents are the wastewater that is discharged from factories and other industrial facilities. It can contain heavy metals, solvents, and other pollutants that can be harmful to fish.
Untreated sewage is the wastewater that is not treated before it is discharged into waterways. It can contain bacteria, viruses, and other pathogens that can cause disease in fish and other aquatic life.
All of these types of pollution can have a negative impact on fish health. They can cause fish to become sick, die, or even become extinct. They can also disrupt the food chain and damage ecosystems.
It is important to reduce pollution in order to protect fish and other aquatic life. We can do this by reducing our use of pesticides and fertilizers, by treating wastewater before it is discharged into waterways, and by supporting policies that protect our environment.