The correct answer is option 2, which states that compounds needed for enzymes to function properly are vitamins.

Enzymes are proteins that act as catalysts, meaning they speed up chemical reactions in the body. For enzymes to function optimally, they often require the presence of certain compounds, known as cofactors or coenzymes. Vitamins are organic compounds that are essential for the proper functioning of enzymes. They can serve as coenzymes themselves or can be involved in the synthesis or activation of coenzymes. Vitamins play a crucial role in various enzymatic reactions, including energy metabolism, DNA synthesis, and the production of neurotransmitters. Without an adequate supply of vitamins, enzyme activity can be impaired, leading to potential health issues. Therefore, ensuring a sufficient intake of vitamins through a balanced diet is necessary for enzymes to function properly.