The aerobic digestion of sewage is utilized in the production of

The correct option is "bio fuels".

Aerobic digestion of sewage is a biological process in which microorganisms break down biodegradable organic matter in the presence of oxygen.
During the treatment and processing of sewage, organic waste is converted into valuable energy resources. The primary gaseous byproduct of anaerobic digestion of organic matter or sewage sludge is biogas, which consists mainly of methane and carbon dioxide. Biogas is a type of biofuel that can be utilized to generate electricity, heat, or run vehicles.
Therefore, the aerobic and anaerobic treatment of sewage organic waste is directly utilized in the production of bio fuels.