Question

What is the missing step in this proof?
Given:ΔABC (view diagram)
prove:The sum of the interior angle measures of ΔABC is 180°.
possible answers Below
A.Statement: ∠4≅∠5, and ∠1≅∠3.
Reason: Alternate Interior Angles Theorem

B.Statement: DE←→ is parallel to AC¯¯¯¯¯.
Reason: AB¯¯¯¯¯ is a transversal cutting DE←→ and AC¯¯¯¯¯.

C.Statement: ∠1≅∠4, and ∠3≅∠5.
Reason: Alternate Interior Angles Theorem

D.Statement: ∠1≅∠4, and ∠3≅∠5.
Reason: ∠1 and ∠4 , and ∠3 and ∠5 are pairs of supplementary angles.
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Answer 1

never mind it was c