In figure ABCD, AB = CD, the measure of angle B is 100 degrees, and the measure of angle C is 80 degrees. Which statement is true? a) ABCD is a parallelogram because both pairs of opposite angles are congruent.
b)ABCD is a parallelogram because one pair of opposite sides are both congruent and parallel.
c)ABCD is a parallelogram because the diagonals are congruent.
d)ABCD is not a parallelogram because you both pairs of opposite sides are not congruent.