During boarding, which restriction must be enforced?

• A. No smoking restrictions are enforced
• B. No smoking allowed only in aisles
• C. Smoking is allowed during take-off
• D. A smoking ban applies only in lavatories

Answer: (A)

A no-smoking policy must be actively enforced from boarding through the flight. The best choice reflects that restrictions on smoking are in effect and applied, which aligns with standard safety rules that prohibit smoking anywhere on the aircraft to prevent fire risk and ensure passenger comfort.

That said, smoking is not allowed in any area, including aisles, lavatories, and the cabin, and never during take-off. The other options imply partial or timed allowances or restrictions, which do not meet the required strict prohibition.