I believe this is C. I think this because it is given that all the sides of both the triangles are congruent. And the congruence postulate - SSS means "Side, Side, Side". Since it is given there on the right side of the screen, this seems most likely. Also, it would be hard to tell if the angles are congruent, especially considering they gave you no data that would tell you how to determine this. Therefore I think the answer is C.
Hope this helps! ;)