Option A is correct. Linear pairs of angles are not necessarily congruent
When two lines intersect to form an X shape, the angles are vertical angles and are known to be congruent. Hence the option vertical angle is incorrect.
Alternate interior and exterior angles are also formed when two lines crossed to form a transversal making the angles to be congruent to each other. Therefore options C and D are also incorrect
The angles that sum up to 180degrees form a linear pair. The angles might not be congruent making the option A to be the correct answer.
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