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Option 5 : Only either I or III and II follow 

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

[ alt="Q3Q" src="//storage.googleapis.com/tb-img/production/18/08/Q3Q.PNG" style="height:136px; width:328px">

Conclusions:

I. Some Window are Stone → It’s not sure, hence false.

II. Some Window are Bell → It’s sure, hence true.

III. No window is a stone → It’s not sure, hence false.

IV. Some Bell are Stone → It’s not definitely sure, hence false.

Here conclusion I and III form complementary pair, so conclusion II and either I or III follow.

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