Final answer:
The kingdom Protista is eukaryotic, meaning its organisms have cells with a membrane-bound nucleus and organelles. Protists can be unicellular or multicellular, and this classification includes a wide variety of organisms, including some that can cause human diseases like Giardia lamblia.option B is correct answer.
Step-by-step explanation:
The kingdom Protista is made up of eukaryotic organisms. This means that unlike prokaryotic cells found in the domains Bacteria and Archaea, the cells of protists have a membrane-bound nucleus and other membrane-bound organelles.
This is a distinguishing feature of eukaryotic cells. As such, protists are more complex than prokaryotic organisms and can be either unicellular or multicellular. The term 'eukaryotic' comes from the Greek words 'eu' meaning 'true' and 'karyon' meaning 'nucleus.'
An example of an organism in the kingdom Protista is Giardia lamblia, which is a parasitic eukaryote that can cause illness in humans. While Protista used to be a catch-all category for various eukaryotic organisms that did not fit neatly into the kingdoms of animals, plants, or fungi, it's important to note that modern taxonomy is evolving, and the classification of Protista is becoming more nuanced with advances in our understanding of the phylogenetic relationships among organisms.