Three samples of water A, B and 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

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cannot be predicted

answer is C.

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Detailed Solution

Degree of pollution inversely proportional to D.O, hence C is correct answer.

The sample of water with the lowest dissolved oxygen (D.O.) level is the most polluted as it indicates a lack of oxygen availability in the water, which can harm aquatic life. Therefore, in this case, water sample C with a D.O. level of 2.1 ppm is the most polluted.

Water sample A has a D.O. level of 4 ppm, which is higher than both water samples B and C. Water sample B has a D.O. level of 3.8 ppm, which is lower than water sample A but higher than water sample C.

So, the order of the samples from least polluted to most polluted based on their D.O. levels would be: A (4 ppm) < B (3.8 ppm) < C (2.1 ppm).

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