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Which one of the following constitutes a group of the isoelectronic species
A. `NO^(+) , C_(2)^(2-),CN^(-) ,N_(2)`
B. `CN^(-),N_(2),O_(2)^(2-),C_(2)^(2-)`
C. `N_(2),O_(2)^(-),NO^(+),CO`
D. `C_(2)^(2-),O_(2)^(-),CO,NO`

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Correct Answer - A
`{:(NO^(+),CO_(2)^(2-),CN^(-),N_(2)),(14e^(-),14e^(-),14e^(-),14e^(-)):}`

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