Three samples of water A, Band C have the D.O levels of 4 ppm, and 3.8 ppm and 2.1 ppm respectively the most polluted sample of water is

Three samples of water A, Band C have the D.O levels of 4 ppm, and 3.8

1.	Three samples of water A, Band C have the D.O levels of 4 ppm, and 3.8 ppm and 2.1 ppm respectively the most polluted sample of water is
Answer» can not be PREDICTED B C A Answer :C