The production of most of the steel manufactured in the united states begins with the reduction of hematite ore (mostly ferric oxide) with coke (carbon) in a blast furnace to obtain pig iron. the basic reaction is

When producing steel in the United States, reducing hermatite ore, which is mostly ferric oxide, with coke, often referred to as carbon, in a blast furnace will obtain pig iron. The basic reaction that happens here is Fe2O3(s) + 3C(s)> 2Fe(s) + 3CO(g): ΔHr(77°F) = 2.111 *10^5 Btu

Ithink that b is correct but just in case wait to see if someone else answers