Fe and O2 react to form iron (III) oxide. What would happen if the pressure of O2 gas is increased in a closed system?

Fe and O2 react to form iron (III) oxide. What would happen if the pressure of O2 gas is increased in a closed system?

Less reaction will take place.

More iron oxide will be produced.

The reaction mixture will catch fire.

The rate of production of iron oxide will slow down.

I don't quite understand this question or what is being asked. Could you please help?

Thank you!