According to SAS theorem which means Side Angle Side,
The angle which is included between the two sides must be congruent.
Here we are given that
KL = NR
JL = MR
Now in the figure we can clearly see that the angle included between JL & KL is L & the angle included between NR & MR is R.
So for the triangles to be congruent by SAS, angle L must be congruent to angle R.
∠L=∠R
Second option is the right answer.
