A pollutant oxide $Y$ is produced in a car engine, and it contains the non-metal element $X$. In the atmosphere, $Y$ undergoes further oxidation to form $Z$. During this additional oxidation, $1$ mol of $Y$ reacts with $0.5$ mol of gaseous oxygen. $X$ may be nitrogen or sulfur. Which of the following statements about $X$, $Y$ and $Z$ can be true?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct