How do sulphur dioxide,particulates,and arsenic relate to coal-fired plants? 

A)  They are waste products produced in the combustion of coal. 
B)  They are solid wastes that must be disposed of properly. 
C)  They are additives that make coal burn cleanly. 
D)  They are removed almost entirely when pollution controls are used.

Sulphur dioxide, particulates, and arsenic are all produced as waste products during the combustion of coal in coal-fired plants.These substances are harmful to human health and the environment, and must often be removed using pollution control technologies. While there are efforts to improve the cleanliness of coal-fired power, there is still a great deal of work to be done to reduce the emissions of these harmful compounds.