Answer:
A. Polypeptide.
Step-by-step explanation:
Let's remember the concept of each option:
- A peptide is a combination of amino acids in which the amine group of one amino acid has undergone a reaction with the carboxyl group of another amino acid.
- A polysaccharide is a complex carbohydrate polymer formed from the linkage of many monosaccharide monomers.
- A nucleic acid is a large biopolymer consisting of many nucleotides.
- A triglyceride is an ester derived from glycerol combined with three fatty acid molecules.
As you can see, the given general structure would be an amino acid because it contains an amino group and carboxyl group too, so remember that multiple amino acids will form a biological polymer called polypeptide.
The answer would be A. Polypeptide.