A 52-year-old man presents with 2 years of progressive right-sided hearing loss, high-pitched tinnitus, and recent right-sided facial numbness (V1 distribution). Otoscopy is normal. Weber test lateralizes to the left ear; Rinne is positive bilaterally. Pure-tone audiometry shows the pattern marked **C** in the diagram — high-frequency SNHL on the right (mild at 1 kHz, moderate-severe at 4–8 kHz) with normal left ear. Critically, speech discrimination score is only 30% on the right, markedly worse than predicted from the pure-tone average. Stapedial reflexes show decay on the right. Which of the following is the GOLD STANDARD investigation to confirm the diagnosis suggested by the audiometric pattern marked **C**?
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