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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