Answer: B
Step-by-step explanation:
Because m<7 and m<6 share a vertex and doesn’t share any common sides and they are across from each other which means they are vertical and vertical angles are congruent
The missing reason for the 3rd step will be vertical angles are congruent. Then the correct option is B.
The angle is the distance between the intersecting lines or surfaces. The angle is also expressed in degrees. The angle is 360 degrees for one complete spin.
Corresponding angle - If two lines are parallel then the third line. The corresponding angles are equal angles.
Vertically opposite angle - When two lines intersect, then their opposite angles are equal.
The diagram is given below.
Then the missing reason for the 3rd step will be vertical angles are congruent.
Thus, the correct option is B.
More about the angled link is given below.
https://brainly.com/question/15767203
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