The acceleration of a particle in SHM is 0.8ms^-2, when its displacement is 0.2 m. The frequency of its oscillation is

• A

  $\frac{\sqrt{2}}{\mathrm{\pi }}\mathrm{Hz}$

• B

  $\frac{2}{\mathrm{\pi }}\mathrm{Hz}$

• C

  $\frac{1}{\mathrm{\pi }}\mathrm{Hz}$

• D

  $\frac{1}{2\mathrm{\pi }}\mathrm{Hz}$