Which of These Reactions Represents the Removal of Silica from Iron

Multiple Choice

Which of these reactions represents the removal of silica from iron ore in a blast furnace?

A) SiO₂(s) → SiO₂(g)
B) SiO₂(s) + CaO(s) → CaSiO₃(l)
C) SiO₂(s) + 4HF(g) → SiF₄(g) + 2H₂O(g)
D) SiO₂(s) + C(s) → Si(l) + CO₂(g)
E) SiO₂(s) + CO(g) → SiCO₃(l)