X and Y are elements in the same group of the Periodic Table. The 5th to 9th ionisation energies of X and Y are given. Ionisation energy / $\text{kJ mol}^{-1}$: Element X: 5th $11020$, 6th $15160$, 7th $17870$, 8th $92040$, 9th $106437$. Element Y: 5th $6540$, 6th $9360$, 7th $11020$, 8th $33360$, 9th $38600$. Which row is used to identify elements X and Y?
- Aelement X: argon, element Y: neon
- Belement X: chlorine, element Y: fluorine
- Celement X: fluorine, element Y: chlorine
- Delement X: neon, element Y: argon