In the diagram, angle cap j is congruent to angle cap m and line segment JL is congruent to line segment MR What additional information is needed to show triangle JKL is congruent to triangle MNR by SAS?

For SAS, the two triangles need two pairs of corresponding sides and the angle between those sides. The given angle J matches angle M, and side JL matches side MR. The other side next to those angles must therefore match: JK must be congruent to MN, which is choice D.

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