Answer: D

Reasoning: Laparoscopic clearance of common-bile-duct (CBD) stones demands advanced laparoscopic suturing, choledochoscopy and fluoroscopic skills; when such expertise is lacking, guidelines advise converting to an open approach for formal CBD exploration rather than attempting laparoscopic techniques that carry higher risk of bile-duct injury [Jones & Soper, 1996, PMID 8720008; Vecchio & MacFadyen, 2002, PMID 11981684].