Of the individual components of a pre-fire planning package, which component when used with stability charts would be particularly useful in decision-making as it applies to the effect of water accumulated during firefighting efforts and the free surface effect?

Correct Answer: Option B — Deadweight and capacity plan

The deadweight and capacity plan provides essential data on tank volumes and vessel stability characteristics. During firefighting, it allows the Master and Chief Engineer to calculate the impact of accumulated water on the vessel's center of gravity and free surface effect, which is vital for maintaining stability during emergency operations.