A door $1.6 \mathrm{m}$ wide requires a minimum force of $1 \mathrm{N}$ to be applied at the free end to open or close it. The minimum force that is required at a point $0.4 \mathrm{m}$ away from the hinges for opening or closing the door is

• A

  $1.2 \mathrm{N}$
• B

  $2.4 \mathrm{N}$
• C

  $3.6 \mathrm{N}$
• Correct answer
  D

  $4 \mathrm{N}$

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