By definition, a trapezoid is a quadrilateral with only one pair of parallel sides.
Now, as can be seen in part 3 of the question in the photograph provided, we can see that the top and the bottom sides are parallel. This is because the left vertical side acts as a traversal and it is making an angle of 90 degrees with both the top and the bottom sides, thus making them parallel.
The left and the right sides are obviously not parallel and therefore, with only two sides parallel, the given quadrilateral satisfies the definition of a trapezoid. Hence, trapezoid is the correct answer and it should be circled.
