Three particles, an electron (e), a proton (p) and a helium atom (He) are moving in circular paths with constant speeds in the x - y plane in a region where a uniform magnetic field B exists along z - axis. The times taken bye, p and He inside the field to complete one revolution are \[{{t}_{e}}\], \[{{t}_{p}}\] and \[{{t}_{He}}\] respectively. Then,

• A. \[{{t}_{He}}>{{t}_{p}}={{t}_{e}}\]   
• B. \[{{t}_{He}}>{{t}_{p}}>{{t}_{e}}\]
• C. \[{{t}_{He}}={{t}_{p}}={{t}_{e}}\]   
• D. None of these