The correct answer is B. Ozone (O3) is an eye and mucous membrane irritant.
Sulfur dioxide (SO2) is a gas that is produced by burning fossil fuels such as coal and oil. It is a major contributor to acid rain and can also cause respiratory problems in humans.
Carbon dioxide (CO2) is a gas that is produced when humans and animals breathe. It is also a byproduct of the burning of fossil fuels. CO2 is not an eye or mucous membrane irritant.
Nitrous oxide (N2O) is a gas that is produced by the decomposition of organic matter. It is also used as an anesthetic. N2O is not an eye or mucous membrane irritant.
Ozone (O3) is a gas that is formed when oxygen molecules (O2) are split by ultraviolet radiation from the sun. Ozone is a major component of photochemical smog, which is a type of air pollution that is formed when sunlight reacts with pollutants in the air. Ozone can irritate the eyes, nose, throat, and lungs. It can also cause headaches, nausea, and chest pain. In severe cases, ozone exposure can lead to death.