Answer: The correct answer is B) No cell nucleus.
Archaea is a domain that comprises of single celled microorganisms, which are prokaryotes. These organisms can survive in extremely harsh conditions like hot springs and salt water.
Example- Methanogens.
Archea was first classified as a separate group of prokaryotes under the three domain classification system of Carl Woese in 1977 that included Archaea, Bacteria, and Eukarya.
Since they are a group of prokaryotic organisms, therefore, they are devoid of nucleus and membrane bound cell organelles.
Thus, option B) is the right answer.
