The correct answer is B) list until the center of buoyancy is aligned vertically with the center of gravity. In the absence of external forces, adding weight on one side of a floating vessel causes the vessel to list (tilt) to that side. This occurs because the added weight shifts the center of gravity (CG) toward the weighted side, causing the vessel to rotate until the center of buoyancy (CB) becomes aligned vertically with the new CG. This realignment is necessary to maintain equilibrium and restore the vessel's stability. The other options are incorrect because: A) the angle of loll is not relevant in this scenario, C) the draft would decrease at the weighted side, not the center of flotation, and D) trimming to the opposite side would not occur without external forces acting on the vessel.