Answer:
C. SAS
Step-by-step explanation:
The graph of this problem is attached. There you can observe that we demonstrate the congruence using SAS postulate, which is Side-Angle-Side.
This is the postulate we should use because the mid point divides in equal parts by definition, that means, sides RP and RS are congruent, and sides QR and TR are congruent. In addition, angles QRP and TRS are congruent, because they are vertical angle.
So, we have Side-Angle-Side as congruent parts. Therefore, the postulate we have to use is SAS, option C.
