Answer:
The answer is C. retropharyngeal abscess.
Explanation:
A 2 and a half year old patient with severe sore throat, aphonic, pain and difficulty to open and close the mouth and who on physical examination presents markedly erythematous oropharynx without exudate. The soft tissue radiograph of the neck gives us the diagnostic impression that it is a retropharyngeal abscess. Very common in children under 5 years of age.