Select the correct answer.
Given:
, and

Prove:

The diagram shows a line AD parallel to BC. A line is drawn from A to C and from B to D. These lines intersect at M.
Statements Reasons
vertical angles theorem
given
given
alternate interior angles theorem
? ?
definition of congruence
Which step is missing in the proof?
A.
B.
C.
D.



Answer :

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