The correct answer is B) The point to which G may rise and still permit the vessel to possess positive stability. The transverse metacenter is the point where the vertical line through the center of buoyancy intersects the vessel's centerline as the vessel rolls. This point represents the maximum height that the vessel's center of gravity (G) can be raised before the vessel loses positive stability. As long as the center of gravity remains below the transverse metacenter, the vessel will have positive stability. The other options are incorrect because: A) This describes the range of GM, not the definition of the transverse metacenter. C) This is not the definition of the transverse metacenter. D) This describes the shift in the center of buoyancy, not the definition of the transverse metacenter.