In melting of iron, which of the following reactions takes place in Bladt Furnace at 400°C- 600°C________?

• A. CaO+ SiO2——> CaSiO3
• B. 2FeS+3O2——–> 2Fe+ SO2
• C. FeSiO3———> FeSiO3
• D. Fe2O3+ 3CO——–> 2Fe+ 3CO2