An electron is moving in a circular path under the influence of a transverse magnetic field of $3.57 \times 10^{-2} \, T$. If the value of $e/m$ is $1.76 \times 10^{11} \, C/kg$,the frequency of revolution of the electron is
- A$62.8 \, MHz$
- B$6.28 \, MHz$
- C$1 \, GHz$
- D$100 \, MHz$
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