( virus is not a decomposer).Decomposer or saprotrophs is the organism which beak downs or eating as a food source and excreti. So I see both fungi and bacteria are the decomposer in the ecology world( natural world). Fungi is unicellular, can't habitat in all conditions and it's a slow decomposer. Bacteria is in other hand its a microorganisms, it can leave in any harsh conditions (even in radio active material) and its a fast decomposer compare to fungi.
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In these option the ans is bacteria and fungi because both of them act as decomposers