i need help

.u Metro by TMobile '6' 4:25 PM E course.apexlearning.com A student was given the following diagram and asked to prove that 1 a 42. What would be the reason for the third step in the proof? Given: Line A and line Bare parallel. Prove: 41 a 42 Statements I_ 1- Line A and Line B are parallel 2. 1151 Corresponding angles are congruent. 3- 25 Z3 * O A. Vertical angles are congruent. O B. Denition of supplementary angles 0 C. Alternating angles are congruent. O D. Alternating exterior angles are congruent SUBMIT