Why should you not smoke, light matches, or use a lighter when fueling your vehicle?

• Gasoline vapours mix with air, which contains oxygen.
• If an ignition source, such as cigarettes or matches, is introduced, a fire or explosion can occur.
• Nothing happens
• Both A and B
  Explanation:

  "You must not smoke, light matches, or use a lighter while fueling your vehicle. Gasoline vapors mix with air, which contains oxygen. If an ignition source is introduced, such as cigarettes or matches, it can lead to a fire or explosion."