Question

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

Explanation:

Laws are a common and effective way for countries like the United States to reduce air pollution. They set enforceable standards for emissions. Promoting burning coal would likely increase pollution. Consumer choices and voluntary industry actions can have some impact but are often not as comprehensive or reliable as legally - mandated requirements.

Answer:

B. laws mandating lower emissions