Final answer:
In congruent triangles JKL, RST, and YXZ, side JL of triangle JKL corresponds to side RT in triangle RST, which in turn corresponds to side XZ in triangle YXZ; thus side XZ of triangle YXZ is congruent to side JL.
Therefore, correct answer is B.
Step-by-step explanation:
The question involves congruent triangles in geometry. Congruent triangles are triangles that are identical to each other, having the same size and shape, with corresponding sides and angles that are congruent. When it is stated that JKL = RST, it means that triangle JKL is congruent to triangle RST, and therefore each corresponding side and angle of triangle JKL is congruent to the corresponding side and angle of triangle RST.
Similarly, when SRT = YXZ, it implies that triangle SRT is congruent to triangle YXZ. Since the cornerstone of our question is to find the side of triangle YXZ that is congruent to side JL, we need to look at the order of the vertices. In a congruence statement, corresponding parts are listed in the same order. Hence, side SRT corresponds to side YXZ.
To find the specific side of YXZ that corresponds to side JL of triangle JKL, we need to match it with the side of triangle RST that corresponds to JL. Since JL corresponds to RT in triangle RST, and RT corresponds to XZ in triangle YXZ, the side of YXZ that is congruent to JL is indeed side XZ.