Two particles, each of mass $$m$$ and charge $$q$$ are attached at the ends of a light rod of length $$2r$$. The rod is rotated at a constant angular speed $$\omega$$ about an axis perpendicular to the rod passing through its centre. The ratio of magnetic moment of the system to its angular momentum is

A

$$\frac{q}{m}$$

B

$$\frac{q}{2m}$$

C

$$\frac{2q}{m}$$

D

$$\frac{q}{4m}$$