During the course of a voyage, a seaman falls on the main deck and injures his ankle. The Master should submit a Report of Marine Accident, Injury or Death if the __________.

Correct Answer: Option B — injured is unable to perform routine duties

Per 46 CFR § 4.05-1, a marine casualty report is required if an injury renders a crewmember unfit to perform routine duties. This threshold distinguishes reportable incidents from minor injuries that do not impact the vessel's operational capability or the individual's ability to fulfill their assigned watch or work duties.