Compound X is made up of two Period 3 elements, Y and Z. When Compound X reacts with water, it forms only two products: a hydroxide that is slightly soluble and compound Q. Q is a compound containing element Z and hydrogen. When compound Q burns in moist air, it produces an oxide and water. In the oxide, element Z has an oxidation number of $+5$. Which row gives the identities of element Y and element Z?
- AY = Mg, Z = P
- BY = Na, Z = S
- CY = Na, Z = P
- DY = Mg, Z = S