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B
Saline soil
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C
Lake
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D
Mountain
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Solution
The correct option is A Lake The eutrophication is the process of ageing of the water body by the build-up of the substratum due to gradual deaths of the aquatic animals as the organic mass increases. It has been accelerated by the anthropogenic release of the fertilizers from the agricultural run-off as accelerated this process by causing the algal bloom and an increase in the rate of decomposition of the resultant organic mass by the bacteria. There occurs excessive use of the dissolved oxygen and the mix-up of the atmospheric oxygen does not occur due to the thick layer of the algal growth. As a consequence, the aquatic animals die rapidly.