$A$ diatomic molecule has moment of inertia $I$. By applying Bohr's quantization condition,its rotational energy in the $n^{\text{th}}$ level is $[n \geq 1]$ $(h = \text{Planck's constant})$
- 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$n^2\left(\frac{h^2}{8 \pi^2 I}\right)$
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