Most carbon compounds are considered to be macromolecules. This is because these compounds are synthesized with the help of many important molecules like proteins, sugars, nucleic acids, etc.
A carbon atom can bond with four other atoms by covalent bonds. This bonding ability provides a structural as well as a functional role to carbon compounds.
Macromolecules may be defined as a molecule that is composed of a large number of atoms that are held together by each other via specific interactions.
Therefore, the correct option for this question is A.
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