By definition, a rectangle is a parallelogram. So, we discard the first option.
On the other hand, we have that all rectangles can not be squares, since a square has all its sides equal, while the rectangle, poir definition, no.So, we discard the second option.
All quadrilaterals are not rectangles because there are other figures with four sides that are not necessarily rectangular. We discard the third option.
Finally, we have that all squares are rectangles. This statement is true since squares can be rectangles with pairs of equal sides.
