According to the Code of Federal Regulations (46 CFR) for Passenger Vessels, for how long do the drawn and sealed half-pint fuel samples need to be maintained and preserved on board?

Correct Answer: Option B — The samples need to be preserved until that fuel supply is exhausted.

46 CFR 162.050-15 requires that drawn and sealed fuel samples be maintained on board until the fuel supply is exhausted. This ensures that in the event of a fuel-related machinery failure or quality dispute, the specific fuel used during the incident remains available for laboratory analysis.