<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 21-year-old gravida 1 presents to her physicians office for an antepartum visit at 11 weeks gestation. She has complaints of malaise, occasional nausea, and changes in food preferences. Her vital signs include: blood pressure 10070 mm Hg, heart rate 90min, respiratory rate 14min, and temperature 36.8C 98.2F. Examination reveals a systolic ejection murmur along the left sternal border. There are no changes in skin color, nails, or hair growth. No neck enlargement is noted. Blood analysis shows the following:Erythrocyte count 3.5 millionmm3Hb 11.9 gdLHCT 35Reticulocyte count 0.2MCV 85 fLPlatelet count 21,0000mm3Leukocyte count 7800mm3Serum iron 17 μmolLFerritin 120 μgLWhat is the most likely cause of the changes in the patients blood count?? A: Decreased iron transport across the intestinal wall, B: Increase in plasma volume, C: Failure of synthesis of a D-aminolevulinic acid, D: Insufficient iron intake, E: Failure of purine and thymidylate synthesis,  <response>: This is a question about interpreting blood test results in a pregnant patient. The key findings are decreased hemoglobin, hematocrit, and iron levels along with normal MCV and increased plasma volume evidenced by the vital signs. This indicates dilutional anemia secondary to the physiologic increase in plasma volume during pregnancy rather than an iron deficiency anemia. The increased plasma volume dilutes the red blood cells, causing a falsely low hemoglobin and hematocrit. The normal MCV and reticulocyte count indicate the red blood cells themselves are normal in size and production. The low iron levels are also expected in pregnancy due to increased maternal and fetal demands. Therefore, the most likely cause of the changes in this patients blood count is the increase in plasma volume that occurs during a normal pregnancy.B: Increase in plasma volume 