Many Biologists Have Suggested Revising the Kingdom Protista

Many biologists have suggested revising the kingdom Protista.The primary problem with the Protista,as shown in the following figure,is that

A) protists are single-celled organisms and should be grouped with the bacteria or archaeans.
B) the cells of some, but not all, protists contain nuclei and organelles.
C) the current classification model does not suggest an association between the plants and alga despite the presence of chloroplasts in both groups.
D) the amoeboid protists are no more closely related to the rest of the group than are animals and fungi.