You are correct, the statement A) "Kapok life preservers must have vinyl-covered pad inserts" is the true statement concerning life preservers. The reason this is the correct answer is that according to US Coast Guard regulations, kapok-filled life preservers must have vinyl-covered pads or buoyant inserts. This ensures the life preserver maintains its buoyancy even if the kapok becomes waterlogged. The other options are incorrect because: B) Buoyant vests are not the same as approved life preservers, C) Life preservers are specifically designed to turn an unconscious person's face clear of the water, and D) Life preservers can be worn with either side facing outwards as long as they are properly secured.