<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 22-year-old primigravid woman comes to the physician for her initial prenatal visit at 12 weeks gestation. She has had generalized fatigue and shortness of breath over the past 2 months. She has also had a tingling sensation in her toes for the past month. Three years ago, she was treated for gonorrhea. She follows a strict vegan diet since the age of 13 years. Her temperature is 37C 98.6F, pulse is 111min, and blood pressure is 12280 mm Hg. Examination shows pale conjunctivae and a shiny tongue. Muscle tone and strength is normal. Deep tendon reflexes are 2 bilaterally. Sensation to vibration and position is decreased over the upper and lower extremities. When asked to stand, hold her arms in front of her, and close her eyes, she loses her balance and takes a step backward. Which of the following is most likely to have prevented this patients condition?? A: Calcium supplementation, B: Vitamin B12 supplementation, C: Thyroxine supplementation, D: Penicillin G therapy, E: Iron supplementation,  <response>: This is a question about nutritional deficiency in a pregnant vegan woman. The key findings in the patient are fatigue, shortness of breath, tingling sensation in the toes, pale conjunctivae, shiny tongue, decreased vibration and position sensation, and poor balance with eyes closed. These findings are most consistent with vitamin B12 deficiency, which commonly occurs in vegans who do not supplement with B12. Vitamin B12 is essential for red blood cell formation and neurological function. Lack of B12 causes megaloblastic anemia and neurological symptoms like tingling and poor balance. The history of a strict vegan diet since age 13 makes B12 deficiency very likely. None of the other answer choices would directly address this nutritional deficiency.B: Vitamin B12 supplementation 