A proton and a deutron both having the same kinetic energy, enter perpendicularly into a uniform magnetic field B. For motion of proton and deutron on circular path of radius ${R}_{p}$and ${R}_{d}$ respectively, the correct statement is

(a) ${R}_{d}=\sqrt{2}{R}_{p}$            (b) ${R}_{p}={R}_{p}/\sqrt{2}$

(c) ${R}_{d}={R}_{p}$                  (d) ${R}_{d}=2{R}_{p}$

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