A fire requires oxygen to burn.
Oxygen has  eight protons and eight electrons.
A fire requires something with exactly eight protons to burn.
What does a fire require to burn?
Options:
  A transportation fuel
  Something with exactly 2 protons
  chemical to mechanical energy
  Something with exactly eight protons
  Something with exactly 1 proton
  Burning fuel and air
  igniting fuel and oxidiser
  Something with 7 protons