Energy needed in breaking a liquid drop of radius $R$ into $n$ smaller drops,each of radius $r$,is [where $T$ is the surface tension of the liquid].

• A
  $(4 \pi r^2 n - 4 \pi R^2) T$
• B
  $(\frac{4}{3} \pi r^3 n - \frac{4}{3} \pi R^3) T$
• C
  $(4 \pi R^2 - 4 \pi r^2) n T$
• D
  $(4 \pi R^2 - n 4 \pi r^2) / T$