Final answer:
Acellular entities include viruses and prions, which lack cellular structure. Prokaryotes and eukaryotes are cellular and do not fall under the acellular category. The correct answer is A) Only viruses and B) Only prions.
Step-by-step explanation:
The entities that are considered acellular include those that are not composed of cells and do not have cellular structure. In this regard, the correct answer to the question 'Acellular contain what kind?' is A) Only viruses and B) Only prions. Prokaryotes, which include bacteria and archaea, and eukaryotes, which comprise cells of animals, plants, fungi, and protists, are all cellular and thus do not fall under the acellular category. Acellular entities, such as viruses, consist of a nucleic-acid core and a protein capsid, sometimes with an outer lipid envelope, but they lack the characteristics of prokaryotic and eukaryotic cells, such as a nucleus or other organelles.