Question

Which quadrilateral has one pair of parallel sides, but is not a parallelogram?

A.
rhombus

B.
rectangle

C.
trapezoid

D.
square

Answer 1

I definitely just took an exam with this question. The answer is definitely C. Trapezoid. 

Answer 2

Only the trapezoid has one pair of parallel side while all the other quadrilateral( in this question) square, rhombus and rectangle has two pair of parallel sides.

The picture is attached below( parallel sides are shown with arrows).

So,

Option C is correct.