Bacteria are prokaryotes as they lack a true nucleus and membrane-bound organelles.
What are prokaryotes?
Prokaryotes are organisms which lack a true membrane-bound nucleus and organelles. Pro - before and karyon - nucleus. Thus the word prokaryote means before the origin of a true nucleus.
Prokaryotes do not have a nucleus and thus their genetic material is suspended in the cytoplasm. This suspension of genetic material is called a nucleoid. The genetic material contains only one large-sized loop of DNA.
Prokaryotes also have a peptidoglycan cell wall for protection. Some of them have a capsule outside of the cell wall. Prokaryotic cells are smaller than eukaryotes. They do not have membrane-bound organelles but they do contain structurally different 70s ribosomes.
Although prokaryotes are microorganisms, the term microorganisms comprise any organism that is not visible by the unaided eye. This definition can include eukaryotic microorganisms as well.
Therefore, the correct option is bacteria.
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