One Difference Between Gram- Positive and Gram- Negative Bacteria Is

One difference between gram- positive and gram- negative bacteria is

A) gram- positive bacteria are spiral- shaped and gram- negative bacteria are either rod- shaped or spherical.
B) only gram- negative bacteria can form endospores.
C) gram- positive bacteria have more peptidoglycan in their cell walls.
D) gram- positive bacteria have fimbriae but gram- negative bacteria do not.