So, first remember that:
A square is a figure that has four sides, and all of them measure the same. These sides form four right angles.
As you can see,
The figure A is a square.
Now,
A rectangle, is a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.
As you can see,
Figure B is a rectangle.
And, finally,
A parallelogram is a special type of quadrilateral that has equal and parallel opposite sides.
So,
Figure C is a parallelogram.
Notice that the square and the rectangle are also parallelograms, so, figures A,B, and C are parallelograms.