The correct option is E All of the above
Saprophytes are the organisms that feed on dead and decaying organisms; fungus lives on a dead tree and is saprophyte. Heterotrophs derive energy from the oxidation of available organic compounds but can not synthesize them; fungus cannot synthesize organic compounds as autotrophs do.. Consumers are the organisms that depend on producers for food and energy. Fungus depends on the dead plant (producer) and hence is a consumer. Thus, the correct answer is option D.