When a lifeline is required to be attached to a ring life buoy it must be at least __________.

Correct Answer: Option B — 60 feet long

46 CFR 180.70 requires ring life buoys to be fitted with a lifeline that is at least 60 feet long. This length ensures the buoy can be effectively thrown to a person in the water and retrieved or held by the victim while the vessel maneuvers for recovery.