The drawing where you can use the the SAS Congruence Theorem to prove the congruence is (a)
Using the SAS congruence theorem to prove the congruence of triangles
From the question, we have the following parameters that can be used in our computation:
The pair of triangles
By definition:
The SAS Congruence Theorem states that if two sides and the included angle of one triangle are congruent to the corresponding two sides and the included angle of another triangle, then the triangles are congruent.
In option (a), we have that:
The two legs of the triangles are congruent
This is evident by the marks of congruence (I and II) on the corresponding sides
Also, we can see that
The included angle between the corresponding side are congruent
So, we have
Two sides (SS) and an angle (A) between the sides
This can then be rewritten as
SAS
Hence, the pair of triangles is (a)