Answer:
Option-3
Explanation:
Land reclamation is the primary topic in the discussion. Hence statement describing its impact sounds more appropriate. It also covers the topic question more precisely.
The statement that described the limits of requiring land reclamation is option 3, Land reclamation works for mitigating environmental damage at coal mines, but not other types of mines.
Land reclamation refers to the process of developing new land by increasing the elevation of a waterbed or low-lying land or by pumping water out of muddy morass areas. Also it should be worked for mitigating the environmental damage with respect to coal mines.
Therefore we can conclude that the option 3 is correct.
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