Surface tension of a soap solution is  $1.9\times {10}^{-2}\mathrm{N}/\mathrm{m}.$ Work done in blowing a bubble of 2.0 cm diameter will be

• A

  $7.6\times {10}^{-6}\pi \text{ joule }$

• B

  $15.2\times {10}^{-6}\pi \text{ joule }$

• C

  $1.9\times {10}^{-6}\pi \text{ joule }$

• D

  $1\times {10}^{-4}\text{ joule }$