In an ionic compound $A^{+} X^{-}$,the degree of covalent bonding is greatest when
- A$A^{+}$ and $X^{-}$ ions are small
- B$A^{+}$ is small and $X^{-}$ is large
- C$A^{+}$ and $X^{-}$ ions are approximately of the same size
- D$X^{-}$ is small and $A^{+}$ is large
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