The correct response is the SAS congruence theorem.
The SAS (Side-Angle-Side) congruence theorem states that if two sides of one triangle are congruent to two sides of another triangle and the angle between those sides is congruent, then the two triangles are congruent. In this case, since Georgia showed that one pair of angles is congruent between triangles and performed rigid transformations, this indicates that she demonstrated the congruence of the triangles using the SAS theorem.