The ions $S^{2-}, Cl^{-}, K^{+}, Ca^{2+}$ are isoelectronic. Their ionic radii show

• A
  a decrease from $S^{2-}$ to $Cl^{-}$ and then increase from $K^{+}$ to $Ca^{2+}$
• B
  an increase from $S^{2-}$ to $Cl^{-}$ and then decrease from $K^{+}$ to $Ca^{2+}$
• C
  a significant decrease from $S^{2-}$ to $Ca^{2+}$
• D
  a significant increase from $S^{2-}$ to $Ca^{2+}$