In the lower part of the blast furnace (zone of fusion), the temperature is

• A. 400¬¨‚àû to 700¬¨‚àûC
• B. 800¬¨‚àûC to 1000¬¨‚àûC
• C. 1200¬¨‚àûC to 1300¬¨‚àûC
• D. 1500¬¨‚àûC to 1700¬¨‚àûC