Which of the following is the structure of oleum?

  • A
    $HO-SO_2-OH$
  • B
    $HO-SO_2-O-SO_2-OH$
  • C
    $HO-SO_2-O-SO_2-O-OH$
  • D
    $HO-SO_2-O-O-SO_2-OH$

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