An object of mass 'm' is projected with a velocity 'u' at an angle 45° with the horizontal. When the object is at maximum height, its angular momentum about the point of projection is

• A

  $\frac{{\mathrm{mu}}^2}{\mathrm{g}}$

• B

  $\frac{{\mathrm{mu}}^2}{2\mathrm{g}}$

• C

  $\frac{{\mathrm{mu}}^3}{4\sqrt{2}\mathrm{g}}$

• D

  $\frac{\mathrm{mu}\sqrt{\mathrm{u}}}{2\mathrm{g}}$