Isolation of Elements

Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are : (a) CaO + SiO₂ $\to$ CaSiO₃ (b) 3Fe₂O₃ + CO $\to$ 2Fe₃O₄ + CO₂ (c) FeO + SiO₂ $\to$ FeSiO₃ (d) FeO $\to$ Fe + ${{1 \over 2}}$O₂