Your vessel has a displacement of 24,500 tons. It is 529 feet long and has a beam of 71 feet. You have timed your vessel's rolling period to be 25.0 seconds. What is your vessel's approximate GM?

Correct Answer: Option B — 1.56 feet

Vessel stability assessment via the rolling period formula GM = (f * B / T)^2 with a 71-foot beam and 25-second roll period calculates an approximate metacentric height of 1.56 feet.