All life forms are classified into three big super-kingdoms (or domains). How many of these consist of single celled, bacteria-like organisms?

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Consider the basic classification of life into three broad domains: Bacteria, Archaea, and Eukarya. 
Option 1: '1' would imply only a single domain contains all life that is single-celled and bacteria-like. This is inaccurate because both Bacteria and Archaea are single-celled prokaryotes that resemble bacteria but belong to separate domains. 
Option 2: '2' aligns with the fact that there are two domains comprising single-celled, bacteria-like organisms: Bacteria and Archaea. Both groups consist of single-celled organisms lacking a true nucleus, and they are distinct lineages within life’s three-domain system. 
Option 3: '3' would suggest that all three domains are single-celled bacteria-like organisms, which is false because Eukarya includes many multicellular organisms (plants, animals, fungi) and also some single-celled eukaryotes, but not all life forms are single-celled or bacteria-like. 
Thus, evaluating each choice shows that only option 2 correctly states the number of domains containing single-celled, bacteria-like organisms, while the other options misrepresent the distribution of life across the three domains.

My LMS Subjects Quiz Topic 6: The origin of species

All life forms are classified into three big super-kingdoms (or domains). How many of these consist of single celled, bacteria-like organisms?

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