The correct option is A 1974
Pollution is an undesirable change in the physical, chemical or biological characteristics of air, water and land that may affect humans and other organisms.
In order to protect and improve the quality of the environment, the Government of India passed the Environment (Protection) Act in 1986.
The three major forms of environmental pollution that affect the quality of the environment are air pollution, land pollution and water pollution.
Water pollution is defined as the addition of some substances (organic, inorganic or biological) into water which degrades the quality of water and makes it unfit for use.
Realising the importance of maintaining the cleanliness of the water bodies, the Government of India has passed the Water (Prevention and Control of Pollution) Act in 1974 to safeguard the water resources from pollution. This act provides for the prevention and control of water pollution, and for the maintaining or restoring of wholesomeness of water in the country.
In order to improve the quality of air, the Air (prevention and Control of Pollution) Act came into force in 1981 in India. But was amended (made minor changes) in 1987 by including noise as an air pollutant.