X may be either chlorine or a chlorine oxide. When X reacts with water, under suitable conditions, it produces the two acids HCl and HClO$_3$ in the mole ratio of $1$ (HCl) : $5$ (HClO$_3$). What might X be?
- A$\text{Cl}_2$
- B$\text{Cl}_2\text{O}$
- C$\text{ClO}_2$
- D$\text{Cl}_2\text{O}_7$