The phase difference between displacement and acceleration of a particle in a simple harmonic motion is  : 

• A

  $\frac{3\mathrm{\pi }}{2}\mathrm{rad}$

• B

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

• C

  Zero

• D

  $\mathrm{\pi }\mathrm{rad}$