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 Corresponding angles formed by two lines cut by a transversal are always congruent. Which of the following is a counterexample to this assertion? 
 A. the transversal is perpendicular to the two lines 
 B. the transversal is parallel to the two lines 
 C. the two lines cut by a transversal are not parallel 
 D. the two lines cut by a transversal are parallel