PLEASE ANSWER QUICK! 50 POINTS!!!!
How does the structure of amino acids allow them to form a polypeptide?

Options:
A. Each amino acid has an amino group and a carboxyl group.
B. Each amino acid has a hydrogen atom and a carboxyl group.
C. Each amino acid has a carboxyl group and an R group.
D. Each amino acid has an R group and a hydrogen atom.