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Option 2 : Only conclusion II follows

The least possible venn diagram is as follows:

[ alt="adfsgyhjkl 4" src="//storage.googleapis.com/tb-img/production/19/08/adfsgyhjkl%204.PNG" style="width: 264px; height: 143px;">

I. Some ponds are not wells → False (It is possible but not definite)

II. Some wells are pools → True (Some wells are ponds and all ponds are pools)

III. All pools are wells → False (It is possible but not definite)

Hence, only conclusion II follows.
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