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Answer: None of the above
Explanation:
The options include:
A. Land degradation and soil erosion
(B) Problem of overgrazing and ecological degradation
(C) Floods
(D) None of the above
Environmental degradation simply refers to the deterioration of the environment whcih occurs when there's depletion of the resources like soil, water and air, pollution and the the destruction of habitats and ecosystems.
It should be noted that environmental degradation consist of land degradation and soil erosion, problem of overgrazing and ecological degradation, floods etc.
Therefore, the correct option is None of the above.