A 28-year-old competitive swimmer presents with severe otalgia, otorrhea, and aural fullness for 3 days following a swimming competition. Otoscopy reveals an erythematous, edematous external auditory canal with debris, and the tragal sign is positive. Audiometry is performed to assess hearing. The audiogram shown demonstrates the pattern marked **A**. Which of the following best explains the audiometric finding in this patient?
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