ANS:C - 20°C

The average temperature of sewage in India typically ranges from 20°C to 25°C. This range represents the average temperatures observed in various regions across India throughout the year. Sewage temperature can vary based on factors such as climate, season, and local conditions. In general, sewage temperatures in India tend to be relatively warm due to the country's tropical climate and high temperatures experienced in many regions. Therefore, while specific temperatures may vary depending on location and other factors, the average temperature of sewage in India is commonly within the range of 20°C to 25°C.