Under 46 CFR §180.68, a passenger vessel certificated for an oceans or coastwise route must carry how many hand red flare distress signals?

Why C is correct

46 CFR §180.68(a)(1) requires a vessel on an oceans, coastwise, limited coastwise, or Great Lakes route to carry six hand red flare distress signals approved under 46 CFR §160.021. Three is the requirement for lakes, bays, and sounds or rivers routes under §180.68(b)(1).