Answer:
SAS; side angle side
Explanation:
The diagrams indicates that two sides are already congruent:
the sides marked with 3 dashes have the same length
the sides marked with 2 dashes have the same length
These two statements leaves only SAS or Triangles are Not Congruent as the only options.
However, the middle angles are congruent due to the opposite angle law.
The rule states that two angles that are opposite each other when two lines cross have the same degree measure.
Since the middle angle are vertically opposite angles, the only remaining answer is SAS