Answer the following question given this paragraph: 

Natural gas burns cleaner than other fossil fuels. As a result, it causes less air pollution. It also produces less carbon dioxide than the other fossil fuels. Because it burns cleaner than other fossil fuels, natural gas has a good reputation. Still, natural gas does emit pollutants.


Q: Natural gas burns cleaner and produces less carbon dioxide than fuels of what type?

 Choices:

- renewable fuels

- solar energy

- biofuels

- fossil fuels

A:
fossil fuels
