Question

what is a disadvantage of incineration? air pollution emissions are challenging. facilities are free to build. the ash produced is harmless. it produces a lot of electricity.

Explanation:

Incineration can release pollutants like particulate matter, heavy - metals, and dioxins into the air, which is a significant drawback. The other options are either advantages (producing a lot of electricity) or false statements (facilities are not free to build, ash is not always harmless).

Answer:

Air pollution emissions are challenging.