A doubly ionised Li atom is excited from its ground state ($$n = 1$$) to $$n = 3$$ state. The wavelengths of the spectral lines are given by $$\lambda_{32}$$, $$\lambda_{31}$$ and $$\lambda_{21}$$. The ratio $$\lambda_{32}/\lambda_{31}$$ and $$\lambda_{21}/\lambda_{31}$$ are, respectively

A

$$8.1, 0.67$$

B

$$8.1, 1.2$$

C

$$6.4, 1.2$$

D

$$6.4, 0.67$$