Before switching on the ignition, you should:

  1. Be sure only backseat passengers have buckled their seat belts.
  2. Be sure only adult passengers have buckled their seat belts.
  3. Be sure only child passengers have buckled their seat belts.
  4. Be sure all of the vehicle's occupants have buckled their seat belts. ✓

Answer: D. Be sure all of the vehicle's occupants have buckled their seat belts.

Before you switch on the ignition, be sure all of the vehicle's occupants have buckled their seat belts.

Why this is the answer

The Florida handbook gives a pre-start checklist for before you start your engine. One item is to fasten your safety belt and make sure all passengers do the same. The check is not limited to people in the back seat, adults, or children; it covers everyone in the vehicle. The same checklist also tells you to put the vehicle in park or neutral, adjust the seat and mirrors, clear your view, and lock the doors, but the seat belt instruction is the one that matches this question.

Why the other answers are wrong

Remember it

Before the key turns, every belt in the car should be clicked.

Official handbook: Florida Driver License Handbook (FLHSMV), 7. Driving Safety – Backing Up, p. 59

Explanation drafted with AI (deepseek-flash) from the official handbook passage cited above, then checked automatically and by a second model on 2026-10-23. Always confirm with the official handbook.