BOD is preferred to COD as an index of sewage concentration because

1.	BOD is preferred to COD as an index of sewage concentration because
A.	BOD represents both carbonaceous and nitrogenous organic matter while COD may indicate carbonaceous matter only
B.	BOD test is easier to perform and gives more reliable result
C.	BOD relates specifically to putrescible organic matter which is the most objectionable sewage constituent
D.	COD relates to the impurities which can only removed by chemical treatment which is expensive
Answer» C. BOD relates specifically to putrescible organic matter which is the most objectionable sewage constituent

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BOD is preferred to COD as an index of sewage concentration because

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