Which of the following is not the cause of Water Pollution?

The correct answer is Option (1) → Combustion of fossil fuels

Option (1) Combustion of fossil fuels — Not a cause of water pollution. Burning fossil fuels pollutes the air. It is one of the main sources of air pollution, along with mining and industries.

Option (2) Sewage disposal — A cause of water pollution.

Option (3) Cultural activities such as religious fairs — A cause of water pollution. Pilgrimage, religious fairs and tourism also cause water pollution.

Option (4) Disposal of industrial wastes — A cause of water pollution. Most industrial wastes are disposed of in running water or lakes, and poisonous elements reach the rivers and other water bodies.