The correct answer is: A. Sanitary waste
Sanitary waste is a type of wastewater that comes from toilets, sinks, and showers. It is also known as sewage or black water. Sanitary waste contains human waste, such as urine and feces, as well as other household waste, such as soap and detergent.
Industrial waste is wastewater that comes from factories and other industrial processes. It can contain a variety of chemicals and pollutants, which can be harmful to the environment.
Garbage is solid waste that is produced by households and businesses. It can include food scraps, paper, plastic, metal, and other materials.
Sullage is wastewater that comes from kitchens and bathrooms. It can contain food scraps, grease, and other household waste.
Sanitary waste is the most dangerous type of wastewater because it contains human waste, which can contain harmful bacteria and viruses. It is important to treat sanitary waste before it is released into the environment.