The amplitude and time period of a particle of  mass 0.1 kg executing simple harmonic motion are 1m and 6.28 s, respectively. Then its angular frequency and acceleration at a displacement of 0.5 m are respectively

• A

  1 rad/s, 0.5 m/s²

• B

  2 rad/s, 1 m/s²

• C

  0.5 rad/s, 0.5 m/s²

• D

  1 rad/s , 1 m/s²