Given ∠9 = ∠13 , which lines, if any, must be parallel based on the given information? Justify your conclusion.
A. c || d, Converse of the Corresponding Angles Theorem
B. a || b, Converse of the Alternate Interior Angles Theorem
C. c || d, Converse of the Same-Side Interior Angles Theorem
D. not enough information to make a conclusion
