Answer is a. AA Similarity
Reason
In two triangles, if two pairs of corresponding angles are congruent, then the triangles are similar . (you can find the congruent missing angles using the Angle Sum Theorem, all three angles add up to 180.)
Note: SSS is three congruent sides, ASA is angle side angle congruent with an included side and SAS is side angle side, none of these are true for this figure