The correct answer is C. Storm sewage.
Storm sewage is the quantity of liquid waste which flows in sewers during the period of rainfall. It is a mixture of rainwater, surface runoff, and groundwater. Storm sewage is collected in storm sewers and then discharged into rivers, streams, or other bodies of water.
Sanitary sewage is the wastewater from homes and businesses that is generated from toilets, sinks, and showers. It is collected in sanitary sewers and then treated at a wastewater treatment plant before being discharged into a river, stream, or other body of water.
Industrial waste is the wastewater from factories and other industrial facilities. It can contain a variety of pollutants, including heavy metals, chemicals, and solvents. Industrial waste is typically treated at an industrial wastewater treatment plant before being discharged into a river, stream, or other body of water.
None of these is the correct answer because it does not describe the quantity of liquid waste which flows in sewers during the period of rainfall.