Given: p || q, and r || s.

Prove: ∠4 is supplementary to ∠15.

Proof:

17
What is the missing step in the given proof?
A.
Statement: m∠4 = m∠15
Reason: Substitution Property of Equality
B.
Statement: m∠4 + m∠8 = 180°
Reason: definition of supplementary angles
C.
Statement: ∠7 and ∠8 are supplementary.
Reason: Linear Pair Theorem
D.
Statement: m∠4 = m∠16
Reason: Transitive Property of Equality
E.
Statement: ∠15 and ∠8 are supplementary.
Reason: Transitive Property of Equality