Question

What is the next step in the proof? Choose the most logical approach.
a)Statement: ∠1≅∠8 and ∠2≅∠7
Reason: Congruent Supplements Theorem
b)Statement: m∠3+m∠4=180° and m∠7+m∠8=180°
Reason: Linear Pair Theorem
c)Statement: m∠3+m∠5=180° and m∠4+m∠6=180°
Reason: definition of supplementary angles
d)Statement: ∠7≅∠6 and ∠8≅∠5
Reason: Vertical Angles Theorem