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An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii \( \mathrm{r}_{\mathrm{e}}, \mathrm{r}_{\mathrm{p}}, \mathrm{r}_{\alpha} \) respectively in a uniform magnetic field B. The relation between \( \mathrm{r}_{\mathrm{e}}, \mathrm{r}_{\mathrm{p}}, \mathrm{r}_{\alpha} \) is?
A. \( \mathrm{r}_{\mathrm{e}}\mathrm{r}_{\mathrm{p}}\mathrm{r}_{\mathrm{a}} \)
B. \( \mathrm{r}_{\mathrm{e}}\mathrm{r}_{\alpha}\mathrm{r}_{\mathrm{p}} \)
C. \( r_{\mathrm{e}}\mathrm{r}_{\mathrm{p}}=\mathrm{r}_{\alpha} \)
D. \( \mathrm{r}_{\mathrm{e}}\mathrm{r}_{\mathrm{p}}=\mathrm{r}_{\alpha} \)
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