Answer the following question given this paragraph: 

Some of the pollutants from fossil fuels can be filtered out of exhaust before it is released into the air ( Figure below ). Other pollutants can be changed to harmless compounds before they are released. Two widely used technologies are scrubbers and catalytic converters.


Q: Scrubbers and catalytic converters are examples of technologies that change what into harmless compounds?

 Choices:

- contaminants

- toxins

- mutations

- pollutants

A:
pollutants
