There exists at least one quadrilateral which is not 4-sided.
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All four-sided figures are quadrilaterals.
All 4 sided polygons are quadrilaterals such as a square, rectangle, parallelogram, rhombus, kite ... etc
None. The only common property of quadrilaterals is that they are plane figures that are bounded by four straight sides, and that they have four vertices. So far all quadrilaterals are candidates for the answer. But then with each quadrilateral you get some unique property that is not shared by others so NO quadrilateral has all te properties of all the other quadrilaterals.
Quadrilaterals are figures that have four sides and the sum of all its angles is 360 degrees. Examples include the parallelogram, square, rectangle, rhombus, and scalene, right-angled, and isosceles trapezoids.
The circle doesn't fit because it is a curve. The other figures are drawn with line segments; they're polygons. In fact, the other figures are all quadrilaterals.