The correct answer is: A. Domestic sewage
Domestic sewage is the wastewater from residences, businesses, and institutions that is collected and treated by a municipal sewage system. It is a mixture of human waste, food waste, and other household chemicals.
Storm water is rainwater that runs off of streets, parking lots, and other impervious surfaces. It is collected in storm sewers and usually discharged directly into nearby waterways without being
treated.Sullage is wastewater from kitchens and baths that does not contain human waste. It is usually collected in separate pipes from domestic sewage and treated in a different way.
Refuse is solid waste, such as garbage, trash, and rubbish. It is usually collected and disposed of in landfills or incinerators.