Why Should We Be Concerned About Oxides of Sulfur and Nitrogen

Multiple Choice

Why should we be concerned about oxides of sulfur and nitrogen?

A) They lead to the formation of airborne sulfuric and nitric acid.
B) They are produced by breaking ocean waves and so,are distributed globally.
C) They are causing greater tectonic activity in Europe and Asia.
D) They are naturally occurring and,therefore,not considered pollutants.