How do you explain the amphoteric behavior of amino acids?

Options

1. AAmino acids can act as both acids and bases because they contain carboxyl and amino functional groups that can
2. BAmino acids can act as both reducing and oxidizing agents due to the presence of reactive chemical groups in t
3. CAmino acids can act as both catalysts and substrates in enzymatic reactions because of their unique chemical p
4. DAmino acids can act as hydrophilic molecules, depending on the pH of the surrounding environment.