A semisubmersible which flops between forward and aft angles of trim is likely to have __________.

Correct Answer: Option D — KML less than KGL

A floating structure exhibiting a persistent flopping behavior between forward and aft trim angles indicates negative longitudinal metacentric stability. This occurs when the longitudinal metacentric height is compromised, specifically when the longitudinal metacentric radius (KML) is less than the height of the center of gravity (KGL).