The best description is;
A quadrilateral with just 1 pair of parallel sides
Here, we want to selcect the best description that matches a trapezoid
A trapezoid is a four sided shape with two 2 parallel bases
A trapezoid can be isosceles, meaning that its side lengths might be equal
Hence, if two of the sides are equal, we can have that there are equal angles
Hence, the best description is a quadilateral with just a pair of parallel sides