Within an automobile engine, a non-metal element X produces pollutant oxide Y. In the atmosphere, Y then undergoes further oxidation to form Z. For this additional oxidation, $1$ mol of Y reacts with $\frac{1}{2}$ mol of gaseous oxygen. Which element could X be?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct