Answer: e. Mineral salts
Step-by-step explanation:
The minerals helps in maintaining the acid base balance in the body. Thus these minerals act as buffer system for regulating the pH of the bodily fluids especially blood. Even a slight change in the pH can drastically change the structure and functions of the biologically important molecules, the mineral salts prevent such changes. Mineral salts form electrolytes that keeps fluids in the proper compartments and also buffer these fluids. The sodium, potassium and calcium are the important elements of the mineral salts and they maintain the bodily pH.