Which statement defines the group of organisms referred to as protists

Please help

A. It's members are all completely independent-living, single-celled, eukaryotic organisms

B. It's members are prokaryotic, single-celled organisms

C. It's members are eukaryotic organisms that are not fungi, plants, or Animals

D. It's members are all more closely related to the prokaryotes than to the other eukaryotes kingdoms