The correct answer is B) device used to drag for a submerged cable or line. A grapnel is a multi-pronged hook that is typically used to locate and recover submerged lines, cables, or objects. It is lowered into the water on a rope and dragged along the seafloor to snag any obstructions, allowing the user to retrieve the item. This makes it a useful tool for Coast Guard operations involving salvage, recovery, or investigation of underwater hazards. The other answer choices are incorrect because: A) refers to a different type of anchor-related device, C) describes a mechanism for securing a topping lift, and D) is a piece of cargo handling equipment, none of which are accurate descriptions of a grapnel.