An isosceles trapezium
or
a non-isosceles trapezium in which one of the slanted sides is congruent to one of the parallel sides.
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C. Both pairs of opposite sides are congruent and parallel.
A four-sided shape is a quadrilateral. With only one pair of parallel sides, it would be called a trapezoid (UK trapezium).
This figure is infact a square, because a square it the only regular quadrilateral.
A quadrilateral is a shape with four sides. A parallelogram is a quadrilateral that has two pairs of parallel sides (i.e. the sides opposite each other are parallel). A rectangle, for example, is a parallelogram. A trapezoid, however, is an example of a quadrilateral that is not a parallelogram - it has four sides, but only two of them are parallel to each other.
a hexagon