A 28-year-old woman presents with progressive bilateral hearing loss over 2 years, worse on the left. She reports low-pitched tinnitus and notes that she can hear better in noisy environments when she raises her voice. Otoscopy shows a normal, mobile tympanic membrane. Audiometry is shown in the diagram. The pattern marked **B** shows conductive hearing loss with a characteristic notch at 2 kHz on bone conduction. Which of the following best explains the pathophysiology underlying this audiometric finding in otosclerosis?
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