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.