Decomposers are
autotrophs
autoheterotrophs
organotrophs
heterotrophs
C.
organotrophs
Decomposers are organotrophs, ie, they feed on dead bodies of organisms and organic wates of living organism.
Producers are photosynthetic or autotrophic plants which are able to synthesize organic food from inorganic raw materials with the help of solar radiations.
Heterotrophs are also known as organotrophs.