The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T=surface tension of the solution)

Options

A. `4pi (D^(2)-d^(2))T`
B. `8pi (D^(2) - d^(2))T`
C. `pi (D^(2) - d^(2))T`
D. `2pi (D^(2)-d^(2))T`