Question

which of these describes an economic aspect of waste incineration facilities? they are not regulated by the epa. they are very expensive to build. they are completely pollution - free. they are totally illegal in the us.

Explanation:

The question asks for an economic aspect. "They are very expensive to build" relates to cost, which is an economic factor. The other options (not regulated by EPA - regulatory, completely pollution - free - environmental, totally illegal in the US - legal) are not economic aspects.

Answer:

They are very expensive to build.