You are answering a USMLE-style medical question. Question: A 6-year-old boy is brought to the physician because of abdominal distention, fatigue, and night sweats over the past 4 months. He also has a 2-month history of post-prandial fullness and recurrent nonbilious vomiting. He appears pale. Abdominal examination shows hepatosplenomegaly and shifting dullness; there is mild tenderness to palpation. Examination of the skin shows multiple nonblanching maculae. A CT scan of the abdomen shows mesenteric and retroperitoneal lymph node enlargement and nodular thickening of the omentum. A photomicrograph of a biopsy specimen from an enlarged mesenteric lymph node is shown. Immunohistochemical staining of the Ki-67 nuclear antigen shows that the proliferation index of the specimen is > 99%. The structure indicated by the arrows is most likely which of the following? Options: A) Neutrophil B) Human immunodeficiency virus C) B lymphocytes D) Macrophage Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.