In a water sample collected from an industrial cluster, the ratio of BOD:COD is found to be less than 0.3. Which one of the following may be…

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1. A
   There are numerous carbon-based compounds in the sample which are not utilizable by the microbial population.
2. B
   The microbial population efficiently utilizes all the organic compounds present in the sample.
3. C
   The water sample may contain carbohydrates that promote microbial growth.
4. D
   The sample contains lipids and fatty acids which require less oxygen for breakdown.