It is the best to say that most humans sources of air pollution result from ___.?

A. Forestry management

B. Fuel burning

C. Heating devices

D. Vehicle exhaust

B. Fuel burning.

Explanation:

Burning of fossil fuels occurs in electrical power plants, factories, mining and metal extraction industries, incinerators, motor vehicles, aircraft, ships and home furnaces. There are a lot of air pollutants released which includes various gases, smoke, sooth, dust and grit. Also carbon monoxides and oxides of nitrogen and lead are also been formed whenever fuel is incompletely burned into the atmosphere; as this is a colourless, odourless gas that is poisonous to human inhalation.

B / Fuel Burning

would be the answer!