Due to over-fertilization of lakes, the quality of the fish produced:

ADoes not change

BDecreases ✓ Correct

CDoes not improve

DFirst improves and then decreases

Correct answer: (B) Decreases

Explanation

Over-fertilisation of lakes lowers the quality of the fish produced.

Excess nutrients cause eutrophication, algal blooms and falling oxygen that stress fish.

The quality does change, so it does not stay the same.

It does not merely fail to improve, it actively worsens.

It does not first improve and then decrease, the trend is a steady decline.

Severe oxygen loss can trigger large fish kills in eutrophic lakes.

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