The correct answer is C. O3 layer.
The ozone layer is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth’s atmosphere as a whole is about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometers (12 to 19 mi) above Earth, although its thickness varies seasonally and geographically.
The ozone layer is important because it protects life on Earth from harmful ultraviolet radiation. Ultraviolet radiation can cause skin cancer, cataracts, and other health problems. It can also damage plants and animals.
Supersonic jets cause pollution by the thinning of the ozone layer. When supersonic jets fly through the atmosphere, they release nitrogen oxides (NOx) into the air. NOx reacts with ozone in the stratosphere, causing it to break down. This thinning of the ozone layer allows more ultraviolet radiation to reach Earth’s surface, which can have harmful effects on human health and the environment.
CO2, SO2, and O2 are not involved in the thinning of the ozone layer. CO2 is a greenhouse gas that contributes to climate change. SO2 is a pollutant that can cause acid rain. O2 is a necessary gas for life on Earth.