Total 6 figures are given in the question.
A figure is considered polygon if it fits into following properties:
1) Closed and planar shape
2) made of straight sides
3) Only one inside area and only one outside area.
First and second figures of first row have curved edges, so these are not polygon.
Third figure of first row has two inside areas, so this is not a polygon.
First and third figure of second row fits into all properties of polygon, so these are polygons.
Second figure os second row is enclosed with more than one inside areas, so it is not a polygon.
Out of given figures, only 2 figures are polygons.