The main sources of biofertilisers are

$(a)$ Bacteria
$(b)$ Cyanobacteria
$(c)$ Fungi
$(d)$ Protists

  • A

    $(a), (b), (c)$

  • B

    $(a), (b), (d)$

  • C

    $(b), (c), (d)$

  • D

    $(a), (c), (d)$

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