How often are fire hoses required to be tested on a mobile offshore drilling unit?

Correct Answer: Option C — Once a year

46 CFR 109.223 requires that fire hoses on mobile offshore drilling units be tested annually. This testing ensures that hoses are free from rot, leaks, or blockages, guaranteeing they can withstand the required operating pressures during a fire-fighting evolution, thereby maintaining the unit's overall fire safety readiness.