The diagrams illustrate how particles are arranged in three solids: $X$, $Y$ and $Z$. The three solids are krypton, potassium and sodium chloride. Which row gives the correct identification of $X$, $Y$ and $Z$?
- A$X$: krypton, $Y$: potassium, $Z$: sodium chloride
- B$X$: krypton, $Y$: sodium chloride, $Z$: potassium
- C$X$: sodium chloride, $Y$: krypton, $Z$: potassium
- D$X$: sodium chloride, $Y$: potassium, $Z$: krypton