How does adding scrap steel to iron from a blast furnace affect the extraction of iron from ore?

The correct option is It reduces the amount of iron extracted from ore.. This answer is correct because it matches the approved learning objective to explain how adding scrap steel to iron from a blast furnace can reduce the amount of iron extracted from ore in the subtopic Ways of reducing the use of resources.

The correct option is It reduces the amount of iron extracted from ore.. It reduces the amount of iron extracted from ore. is correct because it directly supports the approved learning objective to explain how adding scrap steel to iron from a blast furnace can reduce the amount of iron extracted from ore. This belongs to the subtopic Ways of reducing the use of resources within Life cycle assessment and recycling, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Ways of reducing the use of resources.