Proton, Deuteron and alpha particle of the same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, deuteron and alpha particle are respectively $$r_p, r_d$$ and $$r_\alpha$$. Which one of the following relations is correct?

A

$$r_\alpha = r_p = r_d$$

B

$$r_\alpha = r_p < r_d$$

C

$$r_\alpha > r_d > r_p$$

D

$$r_\alpha = r_d > r_p$$