Of the required ring life buoys for an OSV, how many must be equipped with a waterlight?

Correct Answer: Option C — 2

46 CFR 133.70 requires that for Offshore Supply Vessels (OSVs), at least two of the required ring life buoys must be equipped with a self-igniting waterlight. These lights are essential for marking the position of the buoy in the water during nighttime or low-visibility emergency recovery operations.