Three equal masses $m$ are rigidly connected to each other by massless rods of length $l$ forming an equilateral triangle, as shown above. The assembly is to be given an angular velocity $\omega$  about an axis perpendicular to the triangle. For fixed $\omega$, what is the ratio of the kinetic energy of the assembly for an axis through $\mathrm{B}$ to an axis through $\mathrm{A}$?

• A

  $1:2$

   
• Correct answer
  B

  $2:1$
• C

  $3:2$
• D

  $1:3$

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