Surface tension of a soap solution is $1\cdot 9\times {10}^{-2}\mathrm{N}/\mathrm{m}$ Work done in blowing a bubble of 2 .0 cm diameter will be

• A

  $\left(7\cdot 6\times {10}^{-6}\pi \right)\mathrm{J}$

• B

  $\left(15\cdot 2\times {10}^{-6}\pi \right)\mathrm{J}$

• C

  $\left(1\cdot 9\times {10}^{-6}\mathrm{\pi }\right)\mathrm{J}$

• D

  $\left(1\times {10}^{-4}\pi \right)J$