Angle of projection when the range is a given multiple of the maximum height

1. A.
   $\tan^{-1}\!\left(\frac{1}{2}\right)$
2. B.
   $\tan^{-1}(2)$
3. C.
   $\tan^{-1}\!\left(\frac{1}{4}\right)$
4. D.
   $\tan^{-1}(4)$

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1. A.
   $\sin^{-1}\left(\dfrac{2}{n}\right)$
2. B.
   $\cos^{-1}\left(\dfrac{4}{n}\right)$
3. C.
   $\tan^{-1}\left(\dfrac{4}{n}\right)$
4. D.
   $\tan^{-1}\left(\dfrac{2}{n}\right)$

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