Final answer:
A c) protein supplement contains 42 to 50 percent protein and can be cheaper in the Midwest. Vitamins are categorized as either water-soluble or fat-soluble, with vitamin C being a water-soluble example. Proteins are made from amino acids, some of which must be obtained from the diet.
Step-by-step explanation:
The supplement that contains 42 to 50 percent protein is a protein supplement. Protein supplements can be cheaper in regions where they are more readily produced or accessible, such as the Midwest, due to agricultural practices and local economies influencing product pricing. Vitamins, on the other hand, are required in very small quantities for bodily function and are divided into two categories: water-soluble vitamins and fat-soluble vitamins.
For example, vitamin C is a water-soluble vitamin, which means it can dissolve in water and is excreted by the body when taken in excess. Amino acids, from which proteins are made, can be synthesized by the body, but some must be obtained through diet, emphasizing the role of dietary proteins or supplements in nutrition.