As shown in the figure, a force $F$ is applied on a block of mass $\sqrt{3} \mathrm{~kg}$ placed on a rough horizontal surface. The maximum value of F for the block not to move is (Coefficient of static friction between the block and the surface is $\frac{1}{2 \sqrt{3}}$ and acceleration due to gravity $=10 \mathrm{~m} \mathrm{~s}^{-2}$ )

• A

  5 N
• B

  10 N
• C

  15 N
• Correct answer
  D

  20 N

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