It is best to say that most human sources of air pollution result from?
a. forestry management
b. fuel burning
c. heating devices
d. vehicle exhaust

The answer is letter B.

Fuel burning is one of the major sources of air pollutants in the earth's atmosphere. Through industrialization, the growth of major cities requires technologies that use manufacturing and trade as their major economic yardstick. Fuels are burnt almost everywhere, in cars, motorcycles, factories, and houses. It is no wonder that the climate of the Earth has changed drastically for the past years because of these innovations we have that we consider as "growth." These fossil fuels that burn off release carbon dioxide and other harmful toxins in the air causing major pollution to occur all over the world.

What are the options?