A 12-year-old girl presents with some chest discomfort after playing soccer with her friends. She denies any trauma. She is hemodynamically stable. A chest x ray is performed and reveals a moderate pneumomediastinum. The best next step in her management should be

A Bronchoscopy
B Esophagram
C Chest CT
D No further imaging​
A Bronchoscopy
B Esophagram
C Chest CT
D No further imaging​
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