A cricket fielder can throw the cricket ball with a speed ${\nu }_0$. If he throws the ball while running with speed $\mu$ at an angle $\theta$ to the horizontal, what is the effective angle to the horizontal at which the ball is projected in air as seen by a spectator?  

• A

  ${\tan }^{-1}\left(\frac{v_0\cos \theta }{u+v_0\sin \theta }\right)$

• B

  ${\tan }^{-1}\left(\frac{v_0\sin \theta }{u+v_0\cos \theta }\right)$

• C

  ${\tan }^{-1}\left(\frac{u}{v_0\cos \theta +v_0\sin \theta }\right)$

• D

  ${\tan }^{-1}\left(\frac{v_0\sin \theta +v_0\cos \theta }{u}\right)$