A uniform block of mass $m$ resting on a rough horizontal plane just starts moving when pulled by a string with a force of magnitude $m g$ making an angle of $45^{\circ}$ with the horizontal. Then the block will move if it is

• A

  pulled by a horizontal force of magnitude $m g$.
• B

  pulled by a force of magnitude mg making an angle of $30^{\circ}$ with the horizontal.
• C

  pushed by a force of magnitude mg making an angle of $45^{\circ}$ with the horizontal.
• Correct answer
  D

  pulled by a force of magnitude $m g$ making an angle $60^{\circ}$ with the horizontal.

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