Correct Answer: reduction

Solution : The correct option is reduction .

Reduction is a step in the process of making iron from iron ore. It is sometimes known as iron reduction or iron smelting. Iron reduction is a chemical process that occurs when a reducing agent, such as carbon or carbon monoxide, is heated with iron ore (mostly iron oxide compounds) in a furnace. By reducing the iron oxide to elemental iron, this reaction creates molten iron, which may then be used in other forms and goods.