Which of the following is the expression for determination of calorific value of coal using Davies formulae? (where CV is calorific value, %H is percentage of hydrogen, %C is percentage of carbon, %O is percentage of oxygen and %S is percentage of sulphur.)

• A. CV = (6.543 %H + 403)[%C/3 + %H (%O %S)/8]
• B. CV = (6.543 %H + 403)[%C/3 + %H + (%O %S)/8]
• C. CV = (6.543 %H 403)[%C/3 + %H (%O %S)/8]
• D. CV = (6.543 %H 403)[%C/3 + %H + (%O %S)/8]