Hint: A vitamin is an organic molecule. This biomolecule is needed in the biological system for immunity. It is an essential nutrient that is required in small quantities for proper metabolism.
Complete step by step answer: Vitamin can be two types, one is a water-soluble vitamin, and the other one is a fat-soluble vitamin. The example of the water-soluble vitamin is vitamin B, vitamin C., and the fat-soluble vitamin is vitamin A, Vitamin D, vitamin K., etc. There is another one vitamin which is vitamin H, this vitamin is insoluble in water as well as in fat.
So, the correct option is C.
Additional information: Vitamin D is a fat-soluble vitamin that is naturally present in very few foods, added to others, and available as a dietary supplement. It is also produced endogenously when ultraviolet rays from sunlight strike the skin and trigger vitamin D synthesis. Cholesterol serves as a precursor for the biosynthesis of steroid hormone, bile acid, and vitamin D. It is the principal steroid synthesized by all animals. Invertebrates, hepatic cells typically produce the greatest amounts.
Note: Lack of any vitamins can lead to different diseases. For example, Vitamin D deficiency can lead to a loss of bone density, which can contribute to osteoporosis and fractures (broken bones). In children, it can cause rickets. Rickets is a rare disease that causes the bones to become soft and bend. Vitamin C leads to scurvy diseases. Vitamin B leads to anemia. Etc.