Which statement is TRUE concerning life preservers (Type I personal flotation devices)?

Correct Answer: Option D — Life preservers are designed to turn an unconscious person's face clear of the water.

Type I PFDs are specifically engineered to provide high buoyancy and possess the righting moment necessary to turn an unconscious person from a face-down position to a face-up position in the water. This critical performance standard is mandated by USCG and SOLAS requirements to ensure survival in emergency situations.