How does a public address system function in an event setting?

A public address system plays a crucial role in event settings by amplifying sound. This ensures that messages from speakers can be clearly heard by all attendees, regardless of the size of the venue. Clear communication is vital in events, whether for announcements, speeches, or presentations, and a well-functioning audio system helps to achieve that goal.

In contrast, enhancing visual appeal relates more to lighting, décor, and staging elements rather than sound. Controlling ticket sales and providing seating arrangements are logistical aspects of event planning that do not involve audio functions at all. Thus, the primary function of a public address system is to ensure effective auditory communication, making option B the most appropriate choice.