Correct answer: (B) X has greater self-purification capacity; (C) Y has greater turbulence and/or velocity and/or algal growth
Explanation
The reaeration/deoxygenation ratios are $.92/.23=4.0$ for X and $1.12/.35=3.2$ for Y, giving X the larger relative recovery capacity. Y has a higher oxygen-replenishment coefficient, supporting the intended association in C. X has the lower decay coefficient, not evidence of greater biodegradability. Thus **B, C**. Algal oxygen generation is not itself physical gas-transfer reaeration.
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