A projectile is fired from ground with velocity u at an angle $$\theta$$ with the horizontal. It would be moving perpendicular to its initial direction of projection after a time t equal to

A

$$\frac{u \sin\theta}{g}$$

B

$$\frac{u}{g\cos\theta}$$

C

$$\frac{2u \sin\theta}{g}$$

D

$$\frac{u}{2g \sin\theta}$$