What advantage does adding scrap steel to iron in a blast furnace provide?

Adding scrap steel to iron in a blast furnace reduces the need for iron extraction from ore, making option B the correct choice. This practice is advantageous because it utilizes existing materials, promoting recycling and sustainability. By incorporating scrap steel, manufacturers can supplement their iron production without the environmental and economic costs associated with mining and processing new iron ore.

Utilizing scrap steel also helps decrease the overall demand for raw materials, leading to a more resource-efficient production process. This approach maximizes the use of available resources and minimizes waste, aligning with modern practices that emphasize recycling and the conservation of natural resources.