In the given diagram, .

Prove: and are supplementary.

The transversal line intersects two parallel lines k and p with values of corresponding angles are congruent pairs of corresponding angles are (1, 5), (4, 8), (3, 7), and (2, 6)
Statement Reason
1. given
2. corresponding angles theorem
3. definition of congruent angles
4. and are supplementary linear pair postulate
5. definition of supplementary angles
6. ? substitution property of equality
7. and are supplementary definition of supplementary angles
Which statement is missing in the proof?
A.

B.

C.

D.