Resulting compound will be most covalent when iodide ion is combining with cation which have (all the ion in options have ns 2 np 6 configuration)

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According to Fajan's rules, a compound is most covalent when the cation has a high charge and a small size. A dipositive cation ( $2 +$ charge) has a higher charge than a unipositive cation ( $1 +$ charge). Among the dipositive cations, the one with the smallest radius ( $0.72 \overset{˚}{A}$ ) will lead to the most covalent character. Therefore, option B is correct.

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