Which term describes safety lines around the weatherdecks of a ship?

The term that describes the safety lines around the weatherdecks of a ship is "lifeline." Lifelines are critical for maintaining safety on a vessel, as they provide support to personnel who may be at risk of falling overboard, especially in rough seas or when working near the edge of the deck. These lines are typically made of strong, durable materials that can withstand harsh marine environments and help ensure the security of crew members during operations.

The other terms, while related to ship layout and function, do not accurately refer to the safety lines. "Overhead" pertains to the ceilings inside a ship, often in relation to the areas below deck. "Passageway" refers to corridors or walkways inside the ship that connect different spaces but do not imply safety lines. "Quarters" typically describes living spaces for crew members, highlighting the areas where personnel reside aboard the ship. Thus, "lifeline" is the appropriate term when discussing safety measures implemented around the weatherdecks.