Your vessel's drafts are: FWD 18'-09", AFT 20'-05"; and the KG is 23.8 feet. Use the selected stability curves in the blue pages of the Stability Data Reference Book to determine the righting arm at 30° inclination.

Correct Answer: Option B — 2.1 feet

Applying the mean draft calculated from the given forward and aft marks alongside the 23.8 feet KG to the stability curves yields a righting arm of 2.1 feet at 30 degrees inclination.