The correct answer is option 4 - 1, 2 and 3. Folic acid, nicotinic acid, and pantothenic acid are all classified as vitamins.

Vitamins are organic compounds that are essential for the proper functioning of the body. They play a crucial role in various bodily processes such as metabolism, energy production, and the maintenance of overall health.

Folic acid, also known as vitamin B9, is important for DNA synthesis and cell division. It is particularly important for women who are pregnant or planning to become pregnant, as it helps prevent neural tube defects in developing fetuses.

Nicotinic acid, or niacin, is a form of vitamin B3. It is involved in energy production, digestion, and nerve function. It also helps in the synthesis of DNA and has been shown to have a positive effect on cholesterol levels.

Pantothenic acid, or vitamin B5, is necessary for the formation and breakdown of fats, proteins, and carbohydrates. It is also important for energy production and the synthesis of hormones and cholesterol.

Therefore, all three of these compounds - folic acid, nicotinic acid, and pantothenic acid - are considered vitamins, making option 4 the correct answer.