Which of the following substances is used as a fertilizer

1.	Which of the following substances is used as a fertilizer
A.	\[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\]
B.	\[Ca{{({{H}_{3}}P{{O}_{4}})}_{2}}{{H}_{2}}O+CaS{{O}_{4}}\]
C.	\[NaAl{{O}_{2}}\]
D.	\[Ca{{C}_{2}}\]
Answer» C. \[NaAl{{O}_{2}}\]

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Which of the following substances is used as a fertilizer

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