A water drop breaks into 64 identical droplets of each surface area $10^{-7} \mathrm{~m}^2$. If the surface tension of water is $0.07 \mathrm{Nm}^{-1}$, the increase in the surface energy in the process is

• A

  $158 \times 10^{-9} \mathrm{~J}$
• B

  $432 \times 10^{-9} \mathrm{~J}$
• C

  $216 \times 10^{-9} \mathrm{~J}$
• Correct answer
  D

  $336 \times 10^{-9} \mathrm{~J}$

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