An equivalent triangle is formed by three identical rods each of mass m and length l. Then moment of inertia of the triangle about any of its sides is

• A

  $\frac{3}{4}\mathrm{m}{\mathcal{l}}^2$

• B

  $\frac{1}{4}\mathrm{m}{\mathcal{l}}^2$

• C

  $\frac{1}{2}\mathrm{m}{\mathcal{l}}^2$

• D

  $\frac{3}{2}\mathrm{m}{\mathcal{l}}^2$