The answer to this question also depends on the pressure of oxygen. You need to use Ellingham's diagram to get the answer, this is a very well known method for solving redox equilibria, especially for reducing metal oxides in metallurgy. The www is full of diagrams like these, have a look there. Same for most books of inorganic chemisry.

Alain

I agree with Alain. Depending on oxygen pressure and quantity of carbon, it may happen that you have a simple carbon combustion yielding CO or CO2.

It depend upon the pressure applied