$A$ thin uniform rod of mass $m$ and length $l$ is suspended from one end,which can oscillate in a vertical plane about the point of suspension. It is pulled to one side and then released. It passes through the equilibrium position with angular speed $\omega$. The kinetic energy while passing through the mean position is

• A
  $m l^2 \omega^2$
• B
  $\frac{m l^2 \omega^2}{4}$
• C
  $\frac{m l^2 \omega^2}{6}$
• D
  $\frac{m l^2 \omega^2}{12}$