When balancing the following, what is being reduced, what are the reducing agents, and what is the initial and final oxidation states of the reduction agent?

Question

Fe3O4(s) + C(s) > CO2 (g) + Fe

Answer 1

Carbon is being oxidized and Fe3O4 is being reduced.
Reducing agents are the same as what is oxidized.
What do you not understand about determining oxidation states?
http://www.chemteam.info/Redox/Redox-Rules.html

Answer 2

So Fe304 is being reduced and C is the reducing agent? Would the initial and final oxidation states be C and 2C?