Set of iso electronic ions among the following is

Options

A. `Na^(+),Cl^(-),O^(-2)`
B. `K^(+),Ca^(+2),F^(-)`
C. `Cl^(-),K^(+),S^(-2)`
D. `H^(+),Be^(+2),Na^(+)`

Answer

C

Explanation

iso electronic have same no of electrons