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Option 4 : C

The least possible Venn diagram is as follows:

[ alt="Rail syll0" src="//storage.googleapis.com/tb-img/production/20/04/Rail_syll0.PNG" style="width: 310px; height: 132px;">

A. All parrots are trees → False (it is possible but not definite)

B. All parrots are building → False (it is possible but not definite)

C. Some parrots are building → True (it is true from statement)

D. No parrot is a tree → False (it is possible but not definite)

Hence, conclusion "C" is true.

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