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Option 3 : Only III follows

The least possible Venn diagram for the given statements is as follows

[ alt="Federal Bank PO Ashish 2" src="//storage.googleapis.com/tb-img/production/18/08/Federal%20Bank%20PO_Ashish_2.PNG" style="height:152px; width:215px">

Conclusions:

I. No Fuel is an Oil → False.

II. No Gases is a Fuel → False.

III. Some Oil are Fuel → True.

Hence only conclusion III follows.
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