Which safety features are standard on the Warrior PA-28A?

The Warrior PA-28A is designed with several important safety features to enhance the protection of its occupants during flight. The inclusion of a shoulder harness is particularly significant because it is a crucial component for passenger safety during turbulence and potential impact events, helping to keep passengers securely in their seats. The fire extinguisher is a necessary safety measure to address any potential fire in the cockpit or cabin, while the emergency locator transmitter (ELT) is vital for search and rescue operations, aiding in locating the aircraft after an emergency landing or crash.

In contrast, the other options include features that are not standard on the Warrior PA-28A. Automatic seat belts and parachutes are uncommon in general aviation aircraft, as they typically do not incorporate advanced parachute systems within their design. Similarly, the mention of only a fire extinguisher and smoke detector excludes important safety devices like the shoulder harness and ELT, making it an incomplete answer. Lastly, airbags and emergency oxygen masks, while beneficial in some aviation contexts, are not standard safety equipment on the Warrior PA-28A. Therefore, the features listed in the correct answer align accurately with the safety standards of the aircraft.