A stopper used in securing the ground tackle for sea that consists of a grab attached to a turnbuckle is a __________.

Correct Answer: Option B — devil's claw

The devil's claw is a heavy-duty grab hook attached to a turnbuckle, used to secure the anchor chain to the deck. It provides a positive mechanical lock, relieving the windlass brake and preventing the anchor from accidentally deploying while the vessel is underway at sea.