The correct sequence of decreasing number of $\pi$-bonds in the structures of $H_2SO_3$,$H_2SO_4$,and $H_2S_2O_7$ is:

  • A
    $H_2SO_3 > H_2SO_4 > H_2S_2O_7$
  • B
    $H_2SO_4 > H_2S_2O_7 > H_2SO_3$
  • C
    $H_2S_2O_7 > H_2SO_4 > H_2SO_3$
  • D
    $H_2S_2O_7 > H_2SO_3 > H_2SO_4$

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