Who must wear headsets in the control seats of an aircraft?

The correct choice is that persons occupying control seats must wear headsets in the aircraft. This requirement is primarily related to safety and communication. Individuals in control seats—such as pilots—need to maintain clear and effective communication with each other and with air traffic control. Headsets help reduce background noise, making it easier to hear and understand radio transmissions and verbal communications.

Since effective communication is vital for the safe operation of an aircraft, regulatory bodies typically establish guidelines that necessitate headsets in control seats. This ensures that the pilot and any co-pilot can relay important information swiftly and efficiently, which is crucial for navigational accuracy and decision-making during flights.

The other options do not accurately reflect this requirement as they either limit the necessity of headsets to only certain individuals or extend it unnecessarily to passengers. While passengers might also wear headsets for entertainment or noise reduction purposes, it is not a regulatory requirement for their safety.