What is the main function of minerals in the body?

Minerals serve a crucial role in supporting various metabolic processes within the body, which is why this answer is the most appropriate choice. They are essential for numerous biochemical reactions, functioning as cofactors for enzymes, and are vital in processes such as energy production, muscle contraction, and nerve transmission. For instance, minerals like magnesium, zinc, and iron play significant roles in enzymatic functions that drive metabolism.

While minerals are also important in other functions such as regulating water balance, building and repairing tissues, and energy production, the broad classification of "supporting metabolic processes" encompasses a wider range of their functions. This highlights the integral role that minerals play in maintaining overall body homeostasis and facilitating crucial biochemical pathways necessary for life.