Carbon’s ability to form four bonds makes it uniquely suited to form macromolecules. why is that? (choose all that apply) a carbon forms short, simple carbon atoms. b carbon forms large, complex, diverse molecules. c carbon forms covalent bonds with other carbon atoms. d carbon forms covalent bonds that exist in a single plane.

Option C is the correct option. Which is, "Carbon forms covalent bonds with other carbon atoms".

Carbon's ability of catenation  makes it unique and suitable for the formation of macromolecules.

Catenation is the Characteristic of atoms of the same element to form longer chains. Catenation occurs most readily in carbon, which forms covalent bonds with other carbon atoms to form longer chains and structures. This is the reason for the presence of the carbon in all organic compounds.