A vessel that does not possess any reserve buoyancy will sink. Which of the following is considered a direct measure of reserve buoyancy?

Correct Answer: Option A — the vessel's freeboard

Reserve buoyancy represents the watertight volume of the hull above the waterline. Because freeboard measures the vertical distance from the waterline to the main weather deck, it serves as the direct, primary indicator of a vessel's intact reserve buoyancy available to resist sinkage and capsizing.