The only cell organelle seen in a prokaryotic cell is

Explanation:

Eukaryotes and prokaryotes are two distinct cell types. Membrane-bound organelles are found in eukaryotic cells but not in prokaryotic cells.

The ribosome is the only organelle found in both prokaryotic and eukaryotic cells, albeit the types of ribosomes found in each differ.

As a result, B is the correct answer.

Final Answer:

The correct answer is Option B: Ribosomes.