My guess would have to be hydropower, since water isn't an un natural substance
The energy resource that produces the least amount of air pollution is option B, hydropower.
Coal should have a high amount of air pollution. Oil also has a high amount of air population. Natural gas should also have a high amount of the air population. So based on this hydropower should have a minimum amount of air pollution.
learn more about the energy here: https://brainly.com/question/24719731