The earthly impurities in iron ore are removed in the blast furnace by the reaction

A. CO2 + C →2CO
B. Fe2O3 + 3CO →2Fe + 3CO2
C. SiO2 + CaO →CaSiO3
D. CaCO3 → CaO + CO2
E. C +CO2 → CO2

Correct Answer: Option C

C. SiO2 + CaO →CaSiO3