A 72-year-old male presents with a 2-year history of progressive dysphagia, regurgitation of undigested food hours after meals, and halitosis. Barium swallow shows a posterior outpouching at the level of C5–C6 with a narrow neck at Killian's triangle. The structure marked **B** in the diagram represents this narrow diverticular neck. Which of the following best explains why the diverticulum herniates specifically through this anatomical location?
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