ANS:A - 0.5 to 1.0 kg

In sewage, the total solids content can vary depending on various factors such as the source of sewage, the degree of treatment, and the characteristics of the wastewater. However, in general, the approximate total solids content in sewage is typically in the range of 0.5 to 1.0 kg per 1000 kg (1 metric ton) of sewage. Therefore, the correct option is:

• 0.5 to 1.0 kg