Which of the following are classified as water-soluble vitamins?

Water-soluble vitamins are those that dissolve in water and are not stored in the body in significant amounts, meaning they must be consumed regularly in the diet. The vitamins that are classified as water-soluble include the B-complex vitamins (such as B1, B2, B3, B6, B12, folate, etc.) and vitamin C.

The selection suggesting B and C correctly identifies that both the group of B vitamins and vitamin C are classified as water-soluble. These vitamins play crucial roles in various bodily functions including energy production and immune function, among others. Because they are water-soluble, excess amounts are typically excreted through urine rather than stored, which is why regular intake is essential for maintaining adequate levels.

In contrast, options that include vitamins A, D, E, and K refer to fat-soluble vitamins, which are stored in the body's fatty tissues and liver, allowing for a different management of dietary intake.