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 point for vertical measurements. Item 2 represents the baseline from which the vertical center of gravity (KG) and the metacenter (KM) are measured, providing the foundation for all hydrostatic stability calculations.