A small body of mass 10 gram is making harmonic oscillations along a straight line with a time period of π /4 and the maximum displacement is 10cm. The energy of oscillator is

• A

  $0.32\times {10}^{-2}\mathrm{J}$

• B

  $0.16\times {10}^{-2}\mathrm{J}$

• C

  $0.48\times {10}^{-2}J$

• D

  $0.56\times {10}^{-2}\mathrm{J}$