Before an apparatus response from the station the driver/operator should

• A. Assure that everyone is seated and belted
• B. Check tire pressure
• C. Verify parking brake applied
• D. Turn on siren

Answer: (A)

The main idea here is safety of the crew during response. Securing everyone with seat belts before the apparatus starts moving is essential because it protects riders from injury in sudden starts, quick stops, or sharp maneuvers. When the vehicle is accelerating under emergency conditions, unrestrained occupants can be thrown around or ejected, which can be fatal. Making sure all passengers are seated and belted is the most reliable way to minimize those risks as you depart.

Other checks, like tire pressure, parking brake status, or turning on the siren, are important parts of overall operations or vehicle readiness, but they do not protect the crew as directly or immediately as proper seat belt use during movement.