Question

what do the united states and other countries use to reduce air pollution?
laws mandating lower emissions
voluntary actions by industries
promoting burning coal
consumer choices

Explanation:

To reduce air pollution, countries like the US commonly use laws that mandate lower emissions (e.g., the Clean Air Act). Voluntary industry actions are less reliable for widespread reduction, promoting coal increases pollution, and consumer choices are individual - level and less impactful systemically compared to regulatory laws.

Answer:

A. laws mandating lower emissions