The correct answer is d) archaebacteria.
Archaebacteria, or Archaea, are a group of microorganisms that are classified as prokaryotes. Unlike eukaryotic organisms, which have a defined nucleus and other organelles, prokaryotes lack a nucleus and are generally unicellular. The kingdom Archaebacteria includes organisms that can live in extreme environments, such as hot springs and salt lakes, and have unique biochemical properties that distinguish them from bacteria and other prokaryotic life forms.
On the other hand, the kingdoms Plantae, Fungi, and Protista consist of eukaryotic organisms, which have more complex cellular structures. Thus, when considering which kingdom includes prokaryotes, archaebacteria is the accurate choice.