The correct statement of comparison of ultimate BOD, COD, Theoretical Oxygen Demand (ThOD) and 5-day BOD (BOD5) is

• A. BODu > COD > ThOD > BOD5
• B. COD > ThOD > BODu > BOD5
• C. ThOD > COD > BODu > BOD5
• D. COD > BODu > BOD5 > ThOD