i need help ASAP!!!

"A quadrilateral is a trapezoid if and only if it has exactly one pair of parallel sides."

If this statement is true, then which of the following statements must also be true?

A. A trapezoid has exactly one pair of parallel sides if and only if it is a quadrilateral.

B.A quadrilateral has exactly one pair of parallel sides if and only if it is a trapezoid.

C.A quadrilateral is not a trapezoid if and only if it has exactly one pair of parallel sides.

D.A quadrilateral does not have exactly one pair of parallel sides if and only if it is a trapezoid.