Answer is B. SAS
side angle side
Reason
the shared angle is congruent for both triangles.
the two sides are congruent because the ratio of 1:3 for both sides.
2/6 and 3/9 = 1/3 and 1/3
Also correct is AA angle angle
In two triangles, if two pairs of corresponding angles are congruent, then the triangles are similar .
A is the same for both triangles
The corresponding angles are congruent - see attached picture - so angle angle is also correct