Which of the following is a safety measure for towing skiers?

Having a dedicated observer is essential for towing skiers as it enhances the safety of the activity. The observer plays a crucial role by keeping a constant watch on the skier, ensuring their safety, and communicating effectively with the boat operator. This person can alert the operator to any potential hazards or issues, such as the skier falling or needing assistance, which is vital for quick response times.

In contrast, other options may compromise safety. Increasing speed can elevate the risk of accidents, making it more difficult for both the skier and the boat operator to react to unexpected situations. Skiing at night presents additional hazards related to visibility and the ability to see obstacles in the water, which can lead to dangerous situations. Similarly, using a much larger boat does not inherently improve safety; in fact, it may complicate maneuverability and increase the risk of collisions in confined waters. Thus, having a dedicated observer stands out as the most effective and responsible safety measure for towing skiers.