Which statement justifies the conclusion that if b and c are both perpendicular to a, then they are parallel? a. if two lines are cut by a transversal so that corresponding angles are congruent, then the lines are parallel. b. if two lines are perpendicular to the same line, then they are parallel. c. if two lines are parallel to the same line, then they are parallel. d. if two lines are perpendicular to the same line, then they are perpendicular.