The kingdom Protista includes most single-celled eukaryotes.
Option D is the correct answer.
What are eukaryotes?
Eukaryotes are those organisms that have a nucleus in them that is covered by a nuclear membrane.
A combined group of eukaryotes that are not fungi, plants, and animals is called a Protista. When the eukaryotes as different groups of organisms form a kingdom, then it is referred to as kingdom Protista.
Therefore, the eukaryotes with a single cell categorize under the kingdom Protista.
Learn more about the eukaryotes in the related link:
https://brainly.com/question/798543
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