A projectile is fired from ground level at an angle $\theta$ above the horizontal. The elevation angle $\varphi$ of the
highest point as seen from the launch point is related to $\theta$ by the relation

• A

  $\tan \varphi =\frac{1}{4}\tan \theta$

• B

  tan $\varphi$ = tan $\theta$

• C

  $\tan \varphi =\frac{1}{2}\tan \theta$

• D

  tan $\varphi$ = 2tan $\theta$