This provides extra support for both positions.

Burning trash minimizes overall risk in the country, which is why everyone wants to burn trash somewhere. But it localizes that risk in the immediate vicinity of the incineration sites, which is why no one wants to burn trash in their own neighborhood.

Burning trash being hella expensive is a reason to dislike burning trash in general. We need to explain why people are generally in favor of burning trash, but they don’t want to do it in their own neighborhoods.

This lacks the local vs. country-wide dynamic we need. As it stands, (C) is a reason for people to be generally opposed to burning trash at all, no matter where in the country it happens.

(D) actually undercuts people’s position that they don’t want incinerators in their neighborhoods. Like hey if you’re worried about localized pollution, don’t be! We need the correct answer to explain why people would be against burning trash in their neighborhoods, not address their concerns.

This provides a reason for people to be in favor of burning trash in general, but doesn’t explain why they’re against burning trash in their own neighborhoods. The correct answer needs to address both.