Final answer:
Cholecystostomy is the procedure where an incision is made in the gallbladder to drain its contents and remove stones.
Step-by-step explanation:
The procedure that requires an opening into the gallbladder to permit drainage and removal of stones is B. cholecystostomy. A cholecystostomy involves making an incision in the gallbladder to drain its contents and potentially remove gallstones. This is different from the more common cholecystectomy, where the entire gallbladder is removed, and choledochotomy, which involves an incision into the common bile duct. A cholecystojejunostomy is a procedure that creates a connection between the gallbladder and the jejunum but does not specifically cater to stone removal.