According to Bohr's atomic model the electrons move around the nucleus in a circular orbit the electrons can move only in that orbit in which a angular momentum of electrons I sintegral multiple of `h/2pi` i.e.` mvr=nh/2 pi ` where n=principle quantum number r=radius of orbit v=velocity of electron h=plank's constant the energy of orbit in which electron is moving is given by`E_n=-13.6(z^2/n^2)eV//"atom"`
The radius of which of the following orbits is the same as that of the first Bohr's orbit of hydrogen atom?

Options

A. `He^+ (n=2)`
B. `Li^(+2)(n=2)`
C. `Li^(+2)(n=3)`
D. `Be^+3 (n=2)`