Which of the following sets of ions represents a group of isoelectronic ions?
- A$K^+, Cl^-, Ca^{2+}, Sc^{3+}$
- B$Ba^{2+}, Sr^{2+}, K^+, S^{2-}$
- C$N^{3-}, O^{2-}, F^-, S^{2-}$
- D$Li^+, Na^+, Mg^{2+}, Ca^{2+}$
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