A person observes that the full length of a train subtends an angle of $15°$. If the distance between the train and the person is $\mathrm{3 }\mathrm{km}$, the length of the train, calculated using the parallax method, in meters is

• A

  $45$
• B

  $45\pi$
• Correct answer
  C

  $250\pi$
• D

  $75\pi$

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