Answer:
B. SAA (Side-Angle-Angle)
Step-by-step explanation:
In the diagram given, the horizontal sides of the two triangles are equal. Also, by the principle of opposite angles,
< RTS = < QTV
The two angles are equal.
Furthermore, the sum of angles in a triangle is
, so the third angle can be determined since
< RST = < VQT = 
Thus the two triangles are congruent due to side - angle- angle.