Question

I need help please.
1.) Opposite angles are always congruent in a(n)
a) trapezoid b) quadrilateral c) isosceles trapezoid d) parallelogram

2) Consecutive angles are always supplementary in a(n)
a) quadrilateral b) parallelogram c) trapezoid d) isosceles trapezoid

3.) One way to prove that a quadrilateral is a parallelogram is to show that
a) it has one pair of congruent sides. b) it has one pair of parallel sides. c) the diagonals bisect each other. d) the diagonals are congruent.