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(A) Proteins
(B) Amino Acids
(C) Fats
(D) Carbohydrates
Answer: (A) Proteins
Explanation: Enzymes are biological catalysts made up of proteins, which are polymers of amino acids. The specific sequence and structure of amino acids in proteins enable enzymes to perform their catalytic functions. Fats and carbohydrates are not involved in enzyme structure, making proteins.