Option 1: Burning of plastic wastes to keep the environment clean. This option is not appropriate and correct from the point of view of a healthy environment. Burning plastic releases toxic fumes and chemicals into the air, contributing to air pollution and harming both human health and the environment.

Option 2: Burning of dry and fallen leaves in a garden or field. While burning dry and fallen leaves may seem like a common practice, it is not the most appropriate and correct practice from the point of view of a healthy environment. Burning leaves contributes to air pollution by releasing smoke, particulate matter, and harmful gases. It is better to find alternative methods of disposal, such as composting or mulching.

Option 3: Treatment of domestic sewage before its release. This option is the most appropriate and correct practice from the point of view of a healthy environment. Treating domestic sewage before its release is essential to remove harmful pollutants and pathogens, preventing contamination of water sources and protecting aquatic ecosystems. Proper treatment processes can ensure that sewage is properly processed and its impact on the environment is minimized.

Option 4: Use of chemical fertilizers in agricultural fields. While chemical fertilizers may provide nutrients to plants, their excessive use can have negative impacts on the environment. Chemical fertilizers can leach