$X$ and $Y$ are oxides of two different Period $3$ elements. When one mole of $X$ is added to water, the resulting solution is neutralised by exactly one mole of $Y$. What might the identities of $X$ and $Y$ be?
- A$X = \text{P}_4\text{O}_{10}$, $Y = \text{Al}_2\text{O}_3$
- B$X = \text{SO}_3$, $Y = \text{Al}_2\text{O}_3$
- C$X = \text{P}_4\text{O}_{10}$, $Y = \text{Na}_2\text{O}$
- D$X = \text{SO}_3$, $Y = \text{Na}_2\text{O}$