The correct answer is option C. "they can be burned in power plants to generate electricity".
Explanation:
Sanitary landfills are facilities constructed under the the Clean Air Act to produce biogas from anaerobic bacteria growing in solid waste. Later, the natural gases collected from sanitary landfills can be burned in power plants to generate electricity. However, before they can be used for this purpose, the natural gases should be treated to remove the carbon dioxide, water vapor and hydrogen sulfide. Methane is the gas of interest and the one that is used to generate electricity.
