Fig. shows an object of mass 50 gm placed on a rough horizontal surface. The surface together with the block on it is performing simple harmonic motion along the horizontal with a time period 0.5 sec. Coefficient of friction between the block and to surface is $\frac{2}{5}$. Maximum amplitude of such that the object does not slip along the surface is: (g=10 m/s²)
 

• A

  6 cm

• B

  8.5 cm

• C

  2.5 cm

• D

  1.2 cm