Quadrilatera WXYZ is congruent to quadrilateral LKMN
The order of the letters when both quadrilaterals were named is very important, because it tells you which vertex of one of them is congruent with the vertex of the other one, as well as the angles so that:
We know that
m∠W=121º
m∠Y=47º
m∠K=102º
m∠M=90º
And the corresponding angles are congruent so that:
m∠W=m∠L=121º
m∠X=m∠K=102º
m∠Y=m∠N=47º
m∠Z=m∠M=90º
From this we can determine that the measure of m∠L=121º, so the correct option is D.