The correct answer is B. Folic acid.
Folic acid is a water-soluble vitamin that is essential for the synthesis of nucleic acids, the building blocks of DNA and RNA. It is also involved in the production of red blood cells and the metabolism of amino acids. Folic acid deficiency can lead to anemia, birth defects, and other health problems.
Tocoferorl (vitamin E) is a fat-soluble vitamin that is important for the health of cells and tissues. It is also an antioxidant, which means that it can protect cells from damage caused by free radicals.
Cyanocobalamine (vitamin B12) is a water-soluble vitamin that is essential for the production of red blood cells and the function of the nervous system. It is also involved in the metabolism of proteins and fats.
Riboflavin (vitamin B2) is a water-soluble vitamin that is important for the metabolism of energy. It is also involved in the production of red blood cells and the function of the nervous system.