Final answer:
Both prokaryotic and eukaryotic cells have ribosomes, which are essential for protein synthesis, along with other common structures including the plasma membrane, cytoplasm, and DNA. The correct option is D.
Step-by-step explanation:
The answer to what prokaryotes and eukaryotes have in common is D) Ribosomes. Both prokaryotic cells and eukaryotic cells have ribosomes, which are the site of protein synthesis. Other cellular structures such as the plasma membrane, cytoplasm, and DNA are also common to both cell types.
However, the cell wall is not present in all eukaryotes and not all cells have a nucleus; prokaryotes lack a nucleus containing their DNA, which is instead found in a nucleoid region. Hence, D is the correct option.