You are answering a USMLE-style medical question. Question: A 13-year-old boy is brought to the physician because of progressive left leg pain for 2 months, which has started to interfere with his sleep. His mother has been giving him ibuprofen at night for “growing pains,” but his symptoms have not improved. One week before the pain started, the patient was hit in the thigh by a baseball, which caused his leg to become red and swollen for several days. Vital signs are within normal limits. Examination shows marked tenderness along the left mid-femur. His gait is normal. Laboratory studies show a leukocyte count of 21,000/mm3 and an ESR of 68 mm/h. An x-ray of the left lower extremity shows multiple lytic lesions in the middle third of the femur, and the surrounding cortex is covered by several layers of new bone. A biopsy of the left femur shows small round blue cells. Which of the following is the most likely diagnosis? Options: A) Osteosarcoma B) Osteochondroma C) Ewing sarcoma D) Osteoid osteoma Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.