A particle of mass m is projected with an initial velocity u at an angle $\mathrm{\theta }$ to horizontal. The torque of gravity on projectile at maximum height about the point of projection is

• A

  $\frac{{\mathrm{mgu}}^2\sin 2\mathrm{\theta }}{2}$

• B

  ${\mathrm{mgu}}^2\sin 2\mathrm{\theta }$

• C

  $\frac{{\mathrm{mgu}}^2\sin \mathrm{\theta }}{2}$

• D

  $\frac{1}{2}{\mathrm{mu}}^2\sin 2\mathrm{\theta }$