The correct answer for the class of aspartame is option 2, which is peptides. Aspartame is an artificial sweetener that is commonly used as a sugar substitute by individuals with diabetes. It is made up of two amino acids, phenylalanine and aspartic acid, which are linked together in a peptide bond. Peptides are a type of organic compound composed of amino acids joined together by peptide bonds.
Carbohydrates, option 1, are organic compounds made up of carbon, hydrogen, and oxygen, and they include sugars and starches. Polyhydric alcohols, option 3, are a type of alcohol with multiple hydroxyl groups. Alkaloids, option 4, are naturally occurring compounds found in plants and often have pharmacological effects. Therefore, neither of these options is the correct class for aspartame.