The pair,in which ions are isoelectronic with $Al^{3+}$ is ..... .
- A$Br^{-}$ and $Be^{2+}$
- B$Cl^{-}$ and $Li^{+}$
- C$S^{2-}$ and $K^{+}$
- D$O^{2-}$ and $Mg^{2+}$
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