Final answer:
None of the given options are not possible causes for air pollution.
Step-by-step explanation:
The correct answer is d. none of the above. None of the options listed are not possible causes for air pollution. Volcanoes can release large amounts of pollutants into the atmosphere, industry can emit various pollutants through their processes, and combustion of fossil fuels by vehicles and power plants is a major source of air pollution. Therefore, the correct answer is d. none of the above.
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