A vessel is inclined at an angle of loll. In the absence of external forces, the righting arm (GZ) is __________.

Correct Answer: Option B — zero

An angle of loll occurs when a vessel with negative initial transverse metacentric height (GM) seeks a new angle of static equilibrium. At this exact point of loll, the center of gravity and buoyant forces align vertically, rendering the righting arm (GZ) momentarily zero.