Answer:
Trapezoid.
Explanation:
Given that Mason drew a quadrilateral with only one pair of opposite sides that are parallel
We know that a quadrilateral is a closed region bounded by four lines called sides with four angles totalling 360 degrees.
Some special types of quadrilaterals are squares, rectangles, parallelograms, trapezoids, etc.
When all four sides and four angles are equal square. When only angles are equal, rectangle. When all four sides are only equal, rhombus. A trapezium is a quadrilateral with only one pair of sides parallel
Hence here what Mason drew is a quadrilateral.