Answer:
ASA congruence postulate
Explanation:
I took geometry last year, this is a big part of geometry, trust me, but how you get this is angle A and angle D are both already shown to be congruent by the arcs, and lines segment AE and line segment ED are both shown to be congruent as well because of the line going through them, the last angle to prove congruence is angle AEB and angle CED are vertical angles, thus they are congruent as well, to sum it up, both triangles are congruent through answer c, Angle Side Angle