Of the three domains, Archaea and Bacteria are both prokaryotes, which means they don't have a nucleus. The main difference between them is that Archaea are found in extreme environments, and Bacteria have cell walls made of peptidoglycan.
On the other hand, Eukarya contains both unicellular and multicellular organisms, with cells organized in organelles.
This means the answer would be:
• A - Archaea
,• B -Eukarya
,• C - Bacteria.