At One Time,biologists Thought That Fungi Were Merely Forms of Plants

At one time,biologists thought that fungi were merely forms of plants that had lost their chlorophyll and had returned to saprotrophy to gain food.What is a reason this is not true?

A) Fungal cell walls contain chitin rather than cellulose.
B) Fungi attack and engulf food for internal digestion.
C) Fungi have flagella at some stage,providing mobility that plants never have.
D) Plants are multicellular and fungi are unicellular or multinucleated noncellular plasmodia.
E) Plants obtain nutrients from the soil and fungi do not.