For a vessel with a block coefficient of 1, the addition of weight at the center of flotation will __________.

Correct Answer: Option D — have no effect on the trim

The center of flotation is the geometric center of the waterplane area. Adding weight exactly at this point results in a parallel sinkage of the vessel. Because the weight is added at the longitudinal center of flotation, there is no change in the longitudinal moment, resulting in no trim change.