Which of the following solutions has an osmotic pressure nearest to that of an equimolar solution of $K_4[Fe(CN)_6]$?

  • A
    $Na_2SO_4$
  • B
    $BaCl_2$
  • C
    $Al_2(SO_4)_3$
  • D
    $C_{12}H_{22}O_{11}$

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