The correct answer is C) 24 hours. The reason for this is that according to the regulations governing survival craft, the fuel aboard a survival craft must be sufficient to power the craft at a speed of 6 knots for a period of at least 24 hours. This ensures that the survival craft has enough fuel to travel a significant distance and provide adequate time for search and rescue operations to locate the craft. The other options are incorrect because 8 hours (A) and 12 hours (B) are not sufficient to meet the 24-hour requirement, and 48 hours (D) exceeds the minimum requirement.