The symbol shown in the illustration and used as a reference, from which the height of the center of gravity is measured, is item number __________. Illustration SF-0022

Correct Answer: Option D — 2

In naval architecture and stability diagrams, the baseline or keel line is the standard reference plane for vertical measurements. Item 2 represents the baseline, from which the vertical center of gravity (KG) is measured. This is fundamental for calculating the vessel's metacentric height and ensuring overall transverse stability.