The ionization enegry of the electron in the hydrogen atom in its ground state is `13.6 ev`. The atoms are excited to higher energy levels to emit radiations of `6` wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

A. n = 4 to n = 3 states

B. n = 3 to n = 2 states

C. n = 3 to n = 1 states

D. n = 2 to n = 1 states