The correct option is C polypeptides
Proteins are very large molecules composed of basic units called amino acids. In addition to containing carbon, hydrogen, and oxygen amino acids contain nitrogen.
When 2, 3, a few (3–10), or many amino acids bond together, they form a dipeptides, tripeptides, oligopeptides, and polypeptides, respectively which constitute a protein. The monomers are amino acids.
Protein molecules are large, complex molecules formed by one or more twisted and folded strands of amino acids. Proteins are highly complex molecules that are actively involved in the most basic and important aspects of life. These include metabolism, movement, defense, cellular communication, and molecular recognition. Hence, the correct answer is option (c).