Decomposers are:

a) Aututrophs     b) Autoheterotrophs      c) Organotrophs      d) Heterotrophs

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Decomposers are heterotrophs. Hence,option (d) is correct.

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 decomposer and detritivore are often interchangeably used, however, detritivores must digest dead matter via internal processes while decomposers can break down cells of other organisms using biochemical reactions without need for internal digestion.[2] Thus, invertebrates such asearthworms, woodlice, and sea cucumbers are detritivores, not decomposers, in the technical sense, since they must ingest nutrients and are unable to absorb them externally.
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