I would say it's A because it sounds like the most important one.
Answer:
Try answer B that should be correct
Explanation:
Answer:
A domain is a taxonomic category above the kingdom level. The three domains are: Bacteria, Archaea, and Eukarya, which are the major categories of life. ... A kingdom is a taxonomic group that contains one or more phyla.
The term that best completes the statement is PROTISTA. It is the Kingdom protista that is considered heterogeneous because it both consists of eukaryotes that are unicellular and multicellular but these cannot be classified as either an animal or a plant.