The functions of the individual amino acids and their roles in protein structure are related mainly to the chemical properties of their side chains. Amino acids are divided into groups based on the relative polarity of their side chains, which indicates their tendency to react. Which of the following statements is true?a. The most hydrophilic amino acids have no oxygen or nitrogen in their side chains.

b. The most hydrophobic amino acids have side chains that are nonpolar and uncharged at physiological pH.

c. The most hydrophilic amino acids have side chains that are polar but uncharged at physiological pH.

d. The most hydrophobic amino acids have side chains with either a negative or positive charge at physiological pH.

e. The most hydrophobic amino acids have side chains that are polar but uncharged at physiological pH.