Me no know the ans, pls hlp meh!

what is a difference between prokaryotic and eukaryotic cells?

a.
prokaryotic cells do not have a nucleus, but eukaryotic cells do.
b.
eukaryotic cells do not have membrane-bound organelles, but prokaryotic cells do.
c.
prokaryotic cells always have cell walls, but eukaryotic cells do not.
d.
organisms with eukaryotic cells are always multicellular, but organisms with prokaryotic cells are not.