Question

Deforestation means (a) disappearance of forests (b) plantation of forests (c) covering of forests (d) none of these

Answer 1

none of these
hope this helps you

Answer 2

here you can say disappearance of forest, but this isn't means that they are disappearing on their own.
As due to some human activity forests are disappearing. So here we can say that.
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I hope this will help you