The correct order of radii is

Options

A. `N lt Be lt B`
B. `F^(-) lt O^(2-) lt N^(3-)`
C. `Na lt Li lt K`
D. `Fe^(+) lt Fe^(2+) lt Fe^(2+)`

Answer

2

Explanation

For isoelectronic species ionic radius `prop(1)/("effective nclear charge")`