Concept:Extracting a metal from its ore by removing oxygen is called reduction.
Explanation:Iron is present in its ore as an oxide, such as
Fe2O3.
In the blast furnace, carbon monoxide,
CO, removes oxygen from the iron oxide.
The removal of oxygen from a compound is a reduction reaction.
This process leaves behind molten iron.
Therefore, the extraction of iron is not decomposition, oxidation, or sublimation.
It is a reduction process because oxygen is taken away from the iron ore.
Answer:C. reduction