A trapezoid (called a trapezium in the UK) has a pair of opposite sides parallel.
so in order to be a trapezoid it must contain only 1 pair of parallel side. so the only one that can be classified as a trapezoid is the quadrilaterals. this an obvious answer because this is the general category a quadrilateral. then the rest are cannot be a trapezoid because they have 2 pair of parallel sides
