Freeboard is measured from the upper edge of the __________.

Freeboard is measured from the upper edge of the deck line. The deck line refers to the upper surface of a ship's deck, which serves as the baseline for determining freeboard. Freeboard is a critical measurement in nautical terms, as it indicates the vertical distance from the waterline to the upper edge of the deck, providing insight into how much of the vessel's hull is above the water. This measurement helps assess the vessel's stability and seaworthiness, particularly in terms of its ability to handle rough seas without taking on water or capsizing.

Other terms in the options refer to different components of a boat. The bulwark is a part of the ship's side that provides added protection, while the gunwale is the top edge of the side of the boat. The sheer strake is a structural longitudinal member that runs along the sides of the hull, which may also be relevant in construction and design but does not represent the point from which freeboard is measured. Understanding the terminology and their specific functions is essential for proper navigation and vessel operation.