Eukaryotic cells have organelles which may:
$(a)$ not be bound by a membrane
$(b)$ be bound by a single membrane
$(c)$ be bound by a double membrane
Group the various sub-cellular organelles into these three categories.

(A-D) Membraneless cell organelles include ribosomes. They are found attached to the surface of the Endoplasmic Reticulum or freely in the cytoplasmic matrix.
$(b)$ Single membrane-bound structures include lysosomes,vacuoles,and microbodies. Lysosomes are typically found in animal cells and protozoans. Prokaryotic cells do not contain lysosomes.
$(c)$ Double membrane-bound structures include the mitochondria,chloroplasts,and the nucleus. In mitochondria,the inner membrane is folded into structures called cristae,which increase the surface area.