All vessels not limited to daylight service shall be fitted with a ring life buoy __________. (small passenger vessel regulations)

Correct Answer: Option B — with a water light to be attached during nighttime operation

46 CFR 180.72 requires ring life buoys to be equipped with a water light for nighttime operations. This ensures that the buoy remains visible to both the person in the water and the crew during recovery efforts, significantly increasing the probability of a successful man-overboard rescue.