A 28-year-old recreational SCUBA diver surfaces after a 20-meter dive with sudden right ear pain, vertigo, aural fullness, and hearing loss. During descent, he was unable to equalize middle ear pressure due to concurrent upper respiratory tract infection with Eustachian tube dysfunction. Otoscopy reveals a retracted tympanic membrane with hemotympanum, injection of the pars flaccida, and no obvious perforation. Audiometry shows right-sided hearing loss with normal bone conduction thresholds (pure air-bone gap). The audiometric and tympanometric findings marked as **A** in the diagram are most consistent with which of the following diagnoses?
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