In illustration D001SA below, what represents the center of gravity?

Correct Answer: Option A — G

In naval architecture diagrams, 'G' represents the center of gravity, the point through which the total weight of the vessel acts vertically downward. 'B' represents the center of buoyancy, 'M' the metacenter, and 'GZ' the righting arm, which is the horizontal distance between the lines of action of gravity and buoyancy.