A charged particle $$q$$ is shot towards another charged particle $$Q$$ which is fixed, with a speed $$v$$ it approaches $$Q$$ upto a closest distance $$r$$ and then returns. If $$q$$ were given a speed $$2v$$, the closest distances of approach would be

A

$$r$$

B

$$2r$$

C

$$r/2$$

D

$$r/4$$