Which one of the following is the appropriate reason for con

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Which one of the following is the appropriate reason for considering the Gondwana rocks as most important of rock systems of India ?

[UPSC CSE Prelims 2010]

More than 90% of limestone reserves of India are found in them

More than 90% of India's coal reserves are found in them

More than 90% of fertile black cotton soils are spread over them

None of the reasons given above is appropriate in this context