What type of cell has membrane-bound organelles, can be unicellular or multicellular, and is structurally complex?

The answer for the above question is Eukaryotic cell.
Eukaryotic cells are cells that contain membrane-bound organelles and the membrane bound nucleus. They are more structurally complex; they have specialized compartments where various reactions can take place. These cells may be unicellular or multicellular, and include protists, plants, fungi, and animal cells. 

The correct answer is a eukaryotic cell.
Eukaryotic cells are complex cells that contain a nucleus and membrane-bound organelles and are enveloped by a plasma membrane. Organisms that have eukaryotic cells include protozoa, fungi, plants, and animals and thus, these organisms are grouped into the domain Eukaryota. On the other hand, organisms with prokaryotic cells, are grouped in Archaea and Bacteria, the other two domains of life.