What are the two types of vitamins based on their solubility?

The two types of vitamins based on their solubility are classified as water-soluble and fat-soluble. Water-soluble vitamins include the B-complex vitamins and vitamin C, which dissolve in water and are not stored in the body to a significant extent. Instead, they are excreted in urine when taken in excess, which emphasizes the need for regular intake through diet.

On the other hand, fat-soluble vitamins consist of vitamins A, D, E, and K. These vitamins are absorbed along with dietary fat and can be stored in the body's fatty tissues and liver, enabling them to be available for use over a longer period. This difference in solubility has important implications for dietary intake and potential toxicity, as excess fat-soluble vitamins can accumulate to harmful levels in the body.

The other options do not correctly represent the established classifications of vitamins. Their terms, such as fiber-soluble and protein-soluble, do not align with nutritional science, making them incorrect in this context.