Two parallel lines are cut by a transversal, as shown below. Solve for b. Then explain your reasoning. What is the solution when solved for b, and why?

A

b = 4, because alternate exterior angles are congruent. Therefore, b + 56 = 5b.

B

b = 70, because corresponding angles are congruent. Therefore, b + 56 = 5b.

C

b = 56, because alternate interior angles are congruent. Therefore, b + 56 = 5b.

D

b = 14, because vertical angles are congruent. Therefore, b + 56 = 5b.