The following optical illusion shows two straight, parallel lines over a background of radial lines, which creates the illusion that the two horizontal liens are not straight or parallel. Mariam used a straightedge to verify that the lines in the picture are straight and not curved. She then took a closer look at the angles formed by one of the transversal lines to prove that the horizontal lines are parallel to each other. Which statement can be used to prove that the two lines are parallel? Choose one more answer

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