Answer:
B
Explanation:
SAS stands for "Side - angle - Side"
To show SAS congruency, we need to have corresponding side lengths and a corresponding included angle.
Since we know that angle B is congruent to angle Y, and segment AB is congruent to segment XY, we need segment BC and segment YZ to be congruent for the triangles to be congruent by SAS.
We can see that angle B and angle Y are corresponding included angles if segments AB and BY are congruent and segments BC and YZ are congruent.
Thus, the answer is B.