The answer would be A. angle-angle similarity. You know that angles D and E are congruent, and you also know that opposite interior angles are congruent (in this case ABE and CBD). The interior angles of a triangle must add up to 180 degrees, so the remaining angles A and C are also congruent. You don't know whether the sides of both triangles are congruent, so at best you can say they are similar.
