Answer:
D. Because it contains membrane-bound organelles
Explanation:
One of the defining features that separates eukaryotic cells from prokaryotic cells would be the organelles, specifically they are membrane-bound. Although prokaryotes also hve organelles, they are not enclosed. This is why they say that eukaryotes have a TRUE NUCLEUS because it is well defined by the membrane that encloses it.
Prokayotic cell organelles are kind of like floating around within its cytoplasm.