uadrilateral ABCD is shown on the coordinate plane. A figure shows a projector is placed 10 meters from a screen ABC with an angle of A 36 degrees projector and A`B`C` with an angle of A`36 degrees. What needs to be proven to conclude that quadrilateral ABCD is a parallelogram? A. side length of AB = side length of CD and slope of BC slope of CD = -1 B. slope of AB = slope of BC and slope of CD = slope of DA C. side length of BC = side length of DA and slope of DA slope of AB = -1 D. slope of AB = slope of CD and slope of BC = slope of DA