The two main contributors to air pollution are coal-fired power plants and automobiles. Thus the correct answer is B.
What is Air pollution?
When any unwanted change occurs in the natural phenomenon of air which caused it is hazardous to intake and causes suffering and pain leads to air pollution.
This air pollution can be caused by the smoke generated from factories, industries, chimneys, automobiles, and smoking from cigarettes which creates a disturbance in the natural air level.
This air pollution leads to many chronic and lung diseases which are damaging to human health and require medical treatment.
To improve the quality of air it is important to reduce substances that are causing it and create awareness for plantations for better and sustainable living.
Therefore, option B coal-fired power plants and automobiles are the appropriate answer.
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