Using a gasoline engine requires burning gasoline.
When the fuel is ignited, it burns with oxygen.
Using a gasoline engine requires igniting gasoline.
If you want to use a gasoline engine, what must you do with the gasoline?

[a] drain the gasoline
[b] wash the gasoline
[c] cool down the gasoline
[d] move to different locations
[e] adding heat
[f] ignite the gasoline
[g] vaporization
[h] evaporation