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Option 2 : Only conclusions II and III follow 

Based on information given Venn diagram can be drawn as,

[ alt="19.07.2018.009" src="//storage.googleapis.com/tb-img/production/18/07/19.07.2018.009.PNG">

Conclusion I: Some rocks are granite  False

Conclusion II: Some marble are rocks  True

Conclusion III: No stones are granite  True

Hence only conclusions II and III follow.

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