All fungi posses a purely cellulosic cell wall.
They are both unicellular and multicellular.
They are heterotrophic.
They are eukaryotic.
Fungi are saprotrophs or parasites (heterotrophic i.e., organisms that cannot synthesize organic compounds and depend on available ones). Fungi can derive their nutrition from live or dead organisms. Yeast is a unicellular fungus, while all other fungi are multicellular. The presence of a chitinous cell wall is a characteristic feature of fungi whereas a cellulosic cell wall is found in plants. Therefore, the correct answer is option A.