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An 18-month-old boy presents with his father for a cough and difficulty breathing. The father states that the child has had nasal congestion and coryza for the last two days. On exam, he has a barking cough, inspiratory stridor, and a prolonged inspiratory phase. Which of the following would you expect to see on radiographic evaluation

A. Edema of the epiglottis
B. Intraluminal membranes of the tracheal wall
C. Subglottic narrowing
D. Thickening of the retropharyngeal space