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A primary factor in determining a vessel's stability is the distribution of weight on the vessel. Stability in a marine context refers to the ability of a vessel to return to an upright position after being tilted by an external force, such as wind or waves. The center of gravity and the center of buoyancy play critical roles in this balance.

When weight is unevenly distributed—such as having a heavy load on one side or placing cargo too high up—this can significantly affect the vessel's center of gravity, making it more prone to capsizing. For example, if cargo is loaded primarily on one side, it can create a list, diminishing stability and increasing the risk of overturning. Maintaining an optimal weight distribution is a crucial aspect of vessel operation and safety management.

The other factors, while they can influence stability in different ways, do not have the same direct impact on this fundamental characteristic. For example, the weight of the cargo alone does not account for how that weight is arranged on the vessel. Similarly, a vessel's speed through the water impacts its handling characteristics but does not directly determine stability in terms of weight distribution. The amount of fuel onboard can affect overall weight but is less critical than how that weight is distributed within the vessel. Thus