Which of the following substances is used as a fertilizer?

  • A
    $K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
  • B
    $Ca(H_2PO_4)_2 \cdot H_2O + CaSO_4$
  • C
    $NaAlO_2$
  • D
    $CaC_2$

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