The horizontal range and the maximum height of a projectile are equal. The angle of projection of the projectile is                                           

• A

  $\mathbf{\theta } = {\tan }^{-1}\left(\frac{1}{4}\right)$

• B

  $\mathbf{\theta } = {\tan }^{-1}\left(4\right)$

• C

  $\mathbf{\theta } = {\tan }^{-1}\left(2\right)$

• D

  $\mathbf{\theta } = {45}^0$