Answer: ASA
Step-by-step explanation: Hello! You can use ASA to prove that the triangles ABC and ABD are congruent. This is because you are given two angles of each triangle. You know that your answer should be ASA or AAA, which are the only two triangle congruence postulates that involve two or more congruent angles. Lastly, you can use the reflexive property. An example of reflexive property is 3 = 3, which means anything is congruent to itself. You know that both triangles share line segment AB, meaning that they have one side and two angles that are congruent. Since you know that the two angles and the included side are congruent, ASA proves that both triangles ABC and ABD are congruent. I hope this helps you!