<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 9-year-old boy is brought to the physician by his mother because of a 3-day history of fever and bleeding after brushing his teeth. His mother also reports that her son has asked to be picked up early from soccer practice the past few days because of fatigue. He appears pale and ill. His temperature is 38.3C 101.1F, pulse is 115min, and blood pressure is 10060 mm Hg. The lungs are clear to auscultation. Examination shows a soft, nontender abdomen with no organomegaly. There are several spots of subcutaneous bleeding on the abdomen and shins. Laboratory studies show a hemoglobin concentration of 7 gdL, a leukocyte count of 2,000mm3, a platelet count of 40,000mm3, and a reticulocyte count of 0.2. Serum electrolyte concentrations are within normal limits. A bone marrow biopsy is most likely to show which of the following findings?? A: Sheets of abnormal plasma cells, B: Normocellular bone marrow, C: Hypocellular fat-filled marrow with RBCs of normal morphology, D: Hypercellular, dysplastic bone marrow with ringed sideroblasts, E: Infiltration of the marrow with collagen and fibrous tissue,  <response>: This is a clinical vignette describing a 9-year-old boy with fever, easy bruising, fatigue, pallor, tachycardia, and laboratory findings of anemia, leukopenia, thrombocytopenia, and decreased reticulocyte count. The key findings are pancytopenia low RBCs, WBCs, and platelets, normal electrolytes, and decreased reticulocyte count. This indicates a problem with bone marrow production of all cell lines rather than a problem with individual cell destruction. A bone marrow biopsy would help determine the cause of the pancytopenia. The hypocellular marrow with normal RBC morphology in choice C would be most consistent with aplastic anemia or bone marrow suppression. Choices A, D and E describe abnormal marrow findings that do not fit with the clinical scenario. Choice B of a normocellular marrow would be unexpected given the pancytopenia.C: Hypocellular fat-filled marrow with RBCs of normal morphology 