If the time of flight of a bullet over a horizontal range $R$ is $T \ s$,the inclination of the direction of projection to the horizontal is
- A$\sin^{-1} \left( \frac{gT^2}{R} \right)$
- B$\tan^{-1} \left( \frac{gT^2}{2R} \right)$
- C$\cos^{-1} \left( \frac{2gT^2}{2R} \right)$
- D$\cot^{-1} \left( \frac{R}{gT^2} \right)$
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