Which of the Following Describes Smog

Which of the following describes smog?

A) An atmospheric condition during which a warm layer of air stalls above a cool layer
B) The precipitation of acidic compounds formed when components of air pollution interact with other components in the air
C) Dust, soot, and other finely divided solid and liquid particles
D) A condition associated with poor air quality that causes eye irritation, irritation of the respiratory tract, and chest pains
E) A mixture of pollutants, principally ground-level ozone