A diatomic molecule has momentof inertia I By Bohr's quantization condition its rotational energy in the $$n^{th}$$ level (n = O is not allowed) is

A

$$\frac{1}{n^2}\left(\frac{h^2}{8 \pi^2 I}\right)$$

B

$$\frac{1}{n}\left(\frac{h^2}{8 \pi^2 I}\right)$$

C

$$n \left(\frac{h^2}{8 \pi^2 I}\right)$$

D

$$n^2 \left(\frac{h^2}{8 \pi^2 I}\right)$$