Which group of organisms fall under the domain of eukaryotes?

The domain of eukaryotes includes all organisms that possess true nuclei within their cells. This characteristic signifies that their cells have a defined nucleus that contains their genetic material, distinguishing them from prokaryotic organisms, which lack a true nucleus. Eukaryotes encompass a diverse range of life forms, including animals, plants, fungi, and many unicellular organisms such as protists. This broad categorization recognizes not only complex multicellular organisms but also simpler ones that fall under the umbrella of eukaryotes.

The other options are limited in scope and do not accurately represent the entire group of eukaryotes. For example, stating that only bacteria are included misidentifies bacteria as prokaryotes, while indicating that only plants or only fungi are part of eukaryotes overlooks the vast diversity of species that share this domain. Therefore, recognizing all organisms with true nuclei captures the comprehensive nature of eukaryotic life.