The graph shows the variation of displacement of a particle executing S.H.M. with time. We infer from this graph that

• A

  The force is zero at time $3\mathrm{T}/4$

• B

  The velocity is maximum at time $\mathrm{T}/2$

• C

  The acceleration is maximum at time T

• D

  The P.E. is equal to total energy at time $\mathrm{T}/2$