Small passenger vessels on rivers routes in cold water must be provided with life floats of an aggregate capacity to accommodate __________.

Correct Answer: Option C — at least 50% of all persons on board or meet certain construction standards

46 CFR 117.130 mandates that small passenger vessels on river routes in cold water provide life floats with an aggregate capacity for at least 50% of all persons on board. This requirement accounts for the specific environmental risks associated with cold water immersion and vessel capacity limitations.