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Option 3 : Only I & III follow
Consider the following least possible Venn diagram,
[ alt="Annotation 2019-05-08 142604ssss" src="//storage.googleapis.com/tb-img/production/19/05/Annotation%202019-05-08%20142604ssss.png" style="width: 218px; height: 96px;">
Conclusions:
I. Some Glass being a Lock is a possibility → True (This possibility is true as shown below).
[ alt="Annotation 2019-05-08 142628sswskk2" src="//storage.googleapis.com/tb-img/production/19/05/Annotation%202019-05-08%20142628sswskk2.png" style="width: 183px; height: 100px;">
II. Some Glass are Key → False (It is possible but not definite).
III. No Key is Mat → True
Hence, only conclusions I & III follow.
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