What must be displayed on a motorboat that is towing a person?

A motorboat that is towing a person must have a person watching the towed individual at all times to ensure the safety of both the person being towed and the vessel's occupants. This observer plays a crucial role in monitoring the towed individual's movements and providing immediate assistance or communication with the operator if an emergency arises. Having an observer allows for a vigilant lookout to keep track of the towed individual’s safety, helping to prevent accidents or injuries.

While other options may pertain to safety practices on boats, they do not fulfill the essential requirement outlined in boating regulations concerning towing activities. For instance, a red flag indicating towing activity is a helpful visual cue to other boaters, but it does not replace the need for an active observer. Similarly, while life jackets are crucial for safety, having them alone does not ensure proper oversight of the person being towed. A warning sign for approaching vessels is important for overall navigation safety, but the primary responsibility remains with the designated observer. Thus, having a person specifically tasked with watching the towed individual is fundamental to ensuring a safe towing operation.