Which of these is TRUE for all the organisms classified into “Kingdom Protista”

The correct answer is eukaryotic.

Explanation: Organisms in the Kingdom Protista are classified as eukaryotic because they have cells with a nucleus and other membrane-bound organelles. While some protists have cell walls (like many algae), not all protists do. They can also be autotrophs (like algae) or heterotrophs (like protozoa), and they can be unicellular or multicellular, but they are primarily known for being unicellular.