which component makes each amino acid unique? amino group carboxyl group r group phosphate group

which component makes each amino acid unique? amino group carboxyl group r group phosphate group
Answer
Brief Explanations:
All amino - acids have an amino group and a carboxyl group. The R - group is what varies among different amino acids, giving each its unique properties. Amino acids do not have a phosphate group as a defining component.
Answer:
C. R group