Which row shows the comparative sizes of the ionic radii of $\text{Na}^+$, $\text{Mg}^{2+}$ and $\text{S}^{2-}$?
- Asmallest $\text{Na}^+$, largest $\text{S}^{2-}$
- Bsmallest $\text{Mg}^{2+}$, largest $\text{S}^{2-}$
- Csmallest $\text{S}^{2-}$, largest $\text{Mg}^{2+}$
- Dsmallest $\text{S}^{2-}$, largest $\text{Na}^+$