A box weighing $$W$$ is placed on a rough horizontal floor. The coefficient of static friction between the box and the floor is $$\mu$$. To move the box, a pulling force $$F$$ is applied along the rope joined to the box at an angle $$\theta$$ with horizontal. By suitable choice of $$\theta$$, the minimum value of $$F$$ that can make the box move is

A

$$\mu W$$

B

$$\frac{W}{\sqrt{1+\mu^2}}$$

C

$$\frac{\mu W}{\sqrt{1+\mu^2}}$$

D

$$\frac{W\sqrt{1-\mu^2}}{\mu}$$