The x-t graph of a particle undergoing simple harmonic is shown below. The acceleration of the particle at $$t = \frac{4}{3}s$$ is-

A

$$\frac{\sqrt{3}}{32}\pi^2 cm/s^2$$

B

$$\frac{-\pi^2}{32} cm/s^2$$

C

$$\frac{\pi^2}{32}\pi^2 cm/s^2$$

D

$$-\frac{\sqrt{3}}{32}\pi^2 cm/s^2$$