In which one of the following ways do prokaryotic cells differ from eukaryotic cells?

A) Prokaryotic cells have a plasma membrane composed entirely of protein.
B) Prokaryotic cells lack a membrane-bound nucleus and other membranous organelles.
C) Prokaryotic cells lack DNA, RNA, and ribosomes.
D) Prokaryotic cells have cytoplasm that is bounded by a cell membrane.
E) Prokaryotic cells have cytoplasm but lack a cell membrane.