Which of the following is NOT one of the fat-soluble vitamins?

Vitamin C is classified as a water-soluble vitamin rather than a fat-soluble vitamin. Fat-soluble vitamins, which include Vitamins A, D, and E, are absorbed along with dietary fat and can be stored in the body's fatty tissue and liver.

In contrast, water-soluble vitamins like Vitamin C dissolve in water and are not stored in the body to a significant degree; they need to be regularly consumed through diet. This fundamental difference in solubility and storage impacts how the body utilizes these vitamins, which is why Vitamin C is not included in the category of fat-soluble vitamins. Understanding this distinction is essential for grasping nutrition and the body's requirements for various vitamins.