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All of them but B because a polygon only needs 3 or more sides when B isn't really a figure.
A polygon is a figure with at least 3 straight sides. 
Figure A- has 6 straight sides so it IS a Polygon
Figure B- Has only 2 straight sides so it is NOT a polygon
Figure C-Has 5 straight sides so it IS a polygon 
Figure D-Has 7 straight sides so it IS a polygon
Hope this helps I I
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