The ratio of the wavelengths of the spectral lines emitted due to transitions $3 \rightarrow 2$ and $2 \rightarrow 1$ orbits in the hydrogen atom is

• A

  $3 :1$
• B

  $9 :17$
• Correct answer
  C

  $27 :5$
• D

  $25 :9$

Hence, the correct answer is option: 'C'.