Both prokaryotic as well as eukaryotic cells have structures in common. All these cells have a plasma membrane, cytoplasm, ribosome and DNA as a genetic material.The plasma or cell membrane is a phospholipid bilayer that protects the cell from the outside environment. The ribosomes are the non-membrane bound organelles where synthesis of protein takes place. The cytoplasm includes the contents of the cell inside the cell membrane that does not include the nucleus.
The answer would be d because limitation of models is basically about non realistic part of models that separate them from real life which is what d is saying.