Which of these is a basic piece of safety equipment found on an aircraft?

Fire extinguishers are indeed a fundamental piece of safety equipment required on every commercial aircraft. Their primary purpose is to combat onboard fires, which can pose a significant risk to the safety of passengers and crew. Proper training ensures that flight attendants know the location of these extinguishers and how to use them effectively in case of an emergency.

On the other hand, luggage trolleys, first-class seating arrangements, and inflight magazines do not play a role in safety. Luggage trolleys are used for transporting baggage; first-class seating arrangements pertain to passenger comfort and class separation; and inflight magazines mainly serve as entertainment and informational material for passengers. None of these options are designed to address safety concerns or emergencies directly, which is why the fire extinguishers are classified as basic safety equipment on aircraft.