The x-t graph of a particle undergoing simple harmonic motion is shown below. The acceleration of the particle at $\mathrm{t}=\frac{2}{3}\mathrm{s}$ is

• A

  $\frac{\sqrt{3}}{32}{\mathrm{\pi }}^2\frac{\mathrm{c}\mathrm{m}}{{\mathrm{s}}^2}\mathrm{ }$
• Correct answer
  B

  $\frac{-{\mathrm{\pi }}^2}{32}\frac{\mathrm{c}\mathrm{m}}{{\mathrm{s}}^2}$
• C

  $\frac{{\mathrm{\pi }}^2}{32}\frac{\mathrm{c}\mathrm{m}}{{\mathrm{s}}^2}$
• D

  $-\mathrm{ }\frac{\sqrt{3}}{32}\mathrm{ }{\mathrm{\pi }}^2\frac{\mathrm{c}\mathrm{m}}{{\mathrm{s}}^2}$

Hence, the correct answer is option: 'B'.