The difference between the radii of `3^(rd)` and `4^(th)` orbits of `Li^(2+)` is `Delta R_(1)` . The difference between the radii of `3^rd` and `4^(th)` orbits of `He^(+)` is `DeltaR_(2)` . Ratio `DeltaR_(1) : Delta R_(2)` is :

Options

A. `8 : 3`
B. `3 : 8`
C. `2 : 3`
D. `3 : 2`