The correct option is B Vitamin B12
Vitamin B-12 is part of the water-soluble B complex of vitamins. It is involved in various functions throughout the body, one of which is red blood cell production. Vitamin B-12 works in conjunction with another B vitamin, folate, to produce red blood cells. Without proper amounts of vitamin B-12, DNA production is impaired, resulting in abnormal red blood cells. Hence, option A is correct