Of the calorific value ranges given below which one is generally for coal?

• A. 2500 - 4000 kcal/kg
• B. 1000 - 2500 kcal/kg
• C. 4000 - 7000 kcal/kg
• D. 8000 - 12000 kcal/kg
• E. 100 - 1000 kcal/kg