Transversal t cuts parallel lines a and b as shown in the diagram. Which equation is necessarily true?

A.

m∠1 = m∠2

B.

m∠4 = m∠6

C.

m∠1 + m∠5 = 90°

D.

m∠3 + m∠5 = 180°

E.

m∠7 = m∠8

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