Final answer:
When approaching a PWC head-on, a sailboat operator should slow down and change course to ensure both vessels can safely pass without risk of collision.
Step-by-step explanation:
Proper Actions for Sailboat Operators
When a sailboat operator is approaching a Personal Watercraft (PWC) head-on, the appropriate action to take would be to slow down and change course. This ensures that both vessels can pass each other safely without risking a collision. The action of shooting a flare or sounding a danger signal with a horn is typically reserved for situations where there is imminent danger or to signal distress, which is not the case in a standard head-on approach. Additionally, maintaining the present course and speed could lead to an avoidable collision, thereby endangering everyone involved. Safe boating practices dictate that proactive steps should be taken to avoid incidents on the water.
In summary, the correct response for a sailboat operator, in this case, would be option a) Slow down and change course to avoid a potential collision.