Protista group includes–

Correct answer: (a) Unicellular eukaryotic organisms

Explanation

Kingdom Protista (in Whittaker's five-kingdom system) contains the single-celled eukaryotes, such as Amoeba, Paramecium, Euglena and diatoms.

Multicellular heterotrophic eukaryotes are placed in the animal kingdom, and green plants in the plant kingdom.