20. What is the purpose of a life buoy? A To extinguish fires B To assist in water rescues C To provide breathing assistance D. To alert the crew in an em ergency

B

A life buoy, also known as a life jacket or personal flotation device (PFD), is primarily designed to assist in water rescues. It is a safety device used to keep an individual afloat in water. The primary purpose of a life buoy is not to extinguish fires, provide breathing assistance, or alert the crew in an emergency. While some life buoys may have additional features, such as lights or whistles, their main function is to provide buoyancy and assist in water rescues. Therefore, the correct answer is option B.