what makes the kingdom Protista unique?

a. Protists share a common ancestor with fungi only.
b. Protists are not made of cells.
c. Protists are single celled.
d. Protists do not share common ancestor.

c. Protists are single celled.

Protists are unique in that they are a diverse group of organisms that can be single-celled or multicellular. They do not fit neatly into the categories of plants, animals, or fungi, and instead form their own kingdom. This diversity makes the kingdom Protista unique compared to other kingdoms in the classification of organisms.