The main sources of biofertilisers are

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(D) Biofertilisers are organisms that enrich the nutrient quality of the soil.$1$. Bacteria: Many bacteria like $Rhizobium$ and $Azospirillum$ fix atm

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All of these

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(D) Biofertilisers are organisms that enrich the nutrient quality of the soil.$1$. Bacteria: Many bacteria like $Rhizobium$ and $Azospirillum$ fix atmospheric nitrogen into organic forms, which are used by plants as nutrients.$2$. Cyanobacteria: These are autotrophic microbes (e.g., $Anabaena$, $Nostoc$) that fix atmospheric nitrogen and also add organic matter to the soil, increasing its fertility.$3$. Fungi: Many fungi form symbiotic associations with the roots of higher plants, known as $Mycorrhiza$ (e.g., $Glomus$). These fungi absorb phosphorus from the soil and pass it to the plant, while also providing resistance to root-borne pathogens and increasing tolerance to salinity and drought.Since all three groups contribute to soil fertility, the correct answer is $	ext{All of these}$.

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