Identifying Hydrophobic Amino Acids

In biochemistry, amino acids are the building blocks of proteins. Each amino acid has a specific structure that includes a central carbon atom, an amino group, a carboxyl group, a hydrogen atom, and a distinctive side chain known as the R group. The chemical properties of the R group determine the characteristics and function of the amino acid.

Which of the following amino acids is considered to be hydrophobic due to its nonpolar side chain?