The electric potential between a proton and an electron is given by\[V={{V}_{0}}\,In\,\frac{r}{{{r}_{0}}}\], where \[{{r}_{0}}\]is a constant. Assuming Bohr's model to he-applicable, write variation of \[{{r}_{n}}\] with n, n being the principal quantum number

• A. \[{{r}_{n}}\propto n\]   
• B. \[{{r}_{n}}\propto 1/n\]
• C. \[{{r}_{n}}\propto {{n}^{2}}\]
• D. \[{{r}_{n}}\propto 1/{{n}^{2}}\]