Which chemical reaction reduces pollution in the air?
- A$\text{S} + \text{O}_2 \rightarrow \text{SO}_2$
- B$\text{N}_2 + \text{O}_2 \rightarrow 2\text{NO}$
- C$2\text{CH}_4 + 3\text{O}_2 \rightarrow 2\text{CO} + 4\text{H}_2\text{O}$
- D$2\text{NO} + 2\text{CO} \rightarrow 2\text{CO}_2 + \text{N}_2$