The COASTAL DRILLER, while in normal transit, experiences a single amplitude roll of 6 degrees. What is the minimum roll period which does not exceed design limits of the legs?

Correct Answer: Option B — 8.0 seconds

Dynamic response calculations for jack-up transit configurations establish minimum allowable natural periods to prevent resonance and excessive structural fatigue. Experiencing a 6-degree single amplitude roll requires maintaining a minimum roll period of 8.0 seconds to stay safely within structural design parameters.