Which one of the following is the appropriate reason for

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

1. More than 90% of limestone reserves of India are found in them
2. More than 90% of India's coal reserves are found in them
3. More than 90% of fertile black cotton soils are spread over rthem
4. None of the reasons given above is appropriate in this context

Correct Option: B

NA